3-11 July 2007
Merida, Mexico
Mexico/General timezone
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Posters 3 + Coffee

Place

Location: Merida, Mexico
Room: Regency (Hyatt)
Date: from 9 Jul 14:45 to 10 Jul 16:15

Description

OG 2.5-2.7; HE 2.1-2.5, 3.1, 3.3-3.5; SH 3.1-3.5, 4.1-4.3, 5.1-5.3

Contribution List

Displaying 228 contributions out of 228
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 120 (6B)
Recent discoveries in gamma ray astronomy at a few 100GeV provide many motivations for extending our coverage of the gamma ray sky to higher energies, up to several 100TeV. After reviewing these motivations we will present simulation-based considerations to drive the design of arrays of Atmospheric Cherenkov telescopes to obtain relevant sensitivity from a few TeV to a few 100TeV.
Presented by Dr. Stephan LEBOHEC, Dr. Pierre COLIN on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.1
We developed a 2D model Stochastic Montecarlo for Cosmic Rays propagation in the Heliosphere.The model solves numerically the transport equation of particles in the heliosphere, including major processes affecting the heliospheric particle transport: diffusion, convection, adiabatic energy losses and drift of particles. We evaluated the modulated flux at several distancies from the sun (i.e. a ... More
Presented by Dr. Davide GRANDI
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2 Board #: 194 (10A)
We study the dependence of the exponent of the power law rigidity spectrum of the galactic cosmic ray (GCR) intensity variations on the range of the GCR particles rigidity using data of neutron monitors and ground meson telescopes. We found that the rigidity spectrum of the GCR intensity variations is hard for neutron monitors with the effective rigidities ~10-15GV and soft for neutron m ... More
Presented by Dr. Krzysztof ISKRA, Prof. Michael ALANIA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 100 (5B)
Geant4 is a Monte Carlo radiation transport toolkit of generalized application in areas such as high-energy physics, nuclear physics, astroparticle physics, or medical physics. Geant4 provides an optical physics process category, allowing the simulation of the production and propagation of light. Such capabilities are well tailored for the simulation of optics systems namely in cosmic-rays e ... More
Presented by Dr. Bernardo TOMÉ on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.4 Board #: 185 (9B)
Here we present the results of a harmonic analysis of the large scale cosmic ray anisotropy as observed by the Milagro observatory. The Milagro observatory is a water Cherenkov detector located in the Jemez mountains outside of Los Alamos, New Mexico. With a high duty cycle and large field-of-view, Milagro is an excellent instrument for measuring this anisotropy with high sensitivity at TeV e ... More
Presented by Mr. Brian KOLTERMAN on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7
The application of fast real-time imaging and pattern recognition to the imaging atmospheric Cherenkov technique has the potential to improve the sensitivity and versatility of stereoscopic arrays. The recently available fast FPGA technology with clock frequencies of 400 MHz allows the rapid pattern recognition of air shower Cherenkov light images from several telescopes for making a trigger ... More
Presented by Prof. Frank KRENNRICH
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 119 (6B)
Milagro is a TeV gamma-ray detector that utilizes a large water Cherenkov detector to observe extensive air showers produced by high energy particles impacting the Earth's atmosphere. Milagro's distinct advantage compared to other TeV gamma-ray detectors is that it views a wide field (2 steradian over-head sky) and it continuously operates (>90% live time). A new background rejection techniq ... More
Presented by Dr. Aous ABDO on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 134 (7A)
A probability density method for VHE gamma-ray source analysis, applicable to both stand alone IAC telescopes and stereoscopic arrays, is presented here. Developed using simulations and Crab data for the Whipple 10m telescope, the technique covers both two-dimensional image and spectral analyses, and background subtraction is implemented either by a modified standard approach using cuts on Hil ... More
Presented by Ms. Alex SYSON on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.5 Board #: 006 (1A)
Detection of radiopulses from moon's surface employing moon based as well as earth based detectors was proposed about several decades back. Inspired by this novel idea a good number of experimental groups have been continuing such investigations. In this paper a moon based experimental set up for receiving lunar radiopulses and then transmitting the same to earth based or satellite base ... More
Presented by Ms. Kalpana ROY SINHA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2 Board #: 202 (10B)
We have investigated a solar activity dependence of a solar wind (SW) effect on cosmic ray intensity (CRI) variations. The SW effect discussed here is not concerned with transient origins such as Forbush decreases nor with known solar modulations. The effect is represented by the regression coefficient of CRI variations with SW velocities. CRI data we used have been recorded by the neutron m ... More
Presented by Prof. Hiroshi KOJIMA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.5 Board #: 018 (1B)
For the design of an optical module for deep-sea cubic kilometre sized neutrino telescopes it is important to optimise performance versus cost. In the framework of the KM3NeT design study we have designed an optical module consisting of a single glass pressure vessel and containing up to about 40 small photomultiplier tubes 40 small photomultiplier tubes including their high-voltage supp ... More
Presented by Prof. PAUL KOOIJMAN on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.3 Board #: 054 (3B)
In the standard model of cosmic structure formation, dark matter haloes form by gravitational instability. The process is hierarchical: smaller systems collapse earlier, and later merge to form larger halos. The probability that a halo of mass m at redshift z will be part of a larger halo of mass M at the present time is described by the progenitor (conditional) mass function f(m,z|M,0), accor ... More
Presented by Dr. Lidia PIERI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7
Currently, the MAGIC telescope is the largest (17m) and most sensitive operating Imaging Air Cherenkov Telescope. With an energy threshold of 50 GeV, MAGIC is capable of constraining various high energy emission models of galactic and extra-galactic sources by bridging the unexplored 10-100 GeV energy range. One of the main experimental challenges to ground-based gamma-ray astronomy is the dis ... More
Presented by Mr. Alvin LAILLE
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.5 Board #: 019 (1B)
The readout of optical modules for deep-sea kilometre sized neutrino telescopes is challenging for many reasons. Power consumption of the electronics placed at the bottom of the sea must be low, and the data have to be transported to shore over distances up to possibly 100 km. We present a novel readout system - developed in the framework of the KM3NeT design study - where the data from ... More
Presented by Prof. PAUL KOOIJMAN on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.1
The paper studies the possibility of measuring a "prompt" muon signal by means of recording multiple interactions of muons. The main problem on data treatment is the reconstruction of the interactions in a muon group which accompanies usually a high energy muon. Results of data processing within the span of 4 years (live time = 22100 hours) are presented.
Presented by Dr. Yuriy NOVOSELTSEV
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.4 Board #: 030 (2A)
The propagation of relativistic strangelets in terrestrial atmosphere is investigated. A model is proposed taking into account strangelets fragmentation when colliding with air nuclei together with the successive energy losses during penetration. New constraints on initial mass and energy are yielded for arrival at various depths and the detection capabilities of high altitude cosmic ray ... More
Presented by Fatma Zouleikha MOHAMMED SAHNOUN
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.6
Passage of cosmic rays in a resonant antenna generates mechanical vibrations, originated by the local thermal expansion caused by the warming up due to the energy lost by the particles crossing the material. The thermo-acoustic model accounts for the amplitude of these vibrations, but recent measurements of the high energy cosmic ray coincidences in the gravitational wave detector Nautilus ... More
Presented by Dr. Carlo LIGI
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.3 Board #: 026 (2A)
The ANTARES Collaboration is building a high energy neutrino telescope at 2500 m depth in the Mediterranean Sea. The experiment aims to search for high- energy cosmic neutrinos through the detection of Cerenkov light induced by muons and showers resulting from neutrino interactions with the surrounding medium. The detector will consist of a three-dimensional array of 900 optical modules h ... More
Presented by Dr. Yvonne BECHERINI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.3 Board #: 043 (3A)
Up to now, analyses of AMANDA data have been limited to searches for diffuse astrophysical sources, time- integrated searches for point sources, and searches for flares and bursts from pre-selected sources (AGN and GRB) over limited time-scales. On the other hand, multi-wavelength studies have shown that emissions can occur in exponential flares or bursts with strengths that can be much great ... More
Presented by Dr. Rodín PORRATA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.2
In the Super-Kamiokande Collaboration, they assert that the abnormality has never found in the electron-like events as for the neutrino oscillation. We examine the electron-like events in the Super-Kamiokande by the Computer Numerical Experiment and discuss their behavior.
Presented by Prof. Eiichi KONISHI
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.2 Board #: 012 (1B)
We analyze the muon-like Events(single ring image ) in the Super-Kamiokande (SK) by the Computer Numerical Experiment. Assuming the parameters of the neutrino oscillation obtained by the SK which characterize the type of the neutrino oscillation, we reproduce the zenith angle distribution of the muon-like events and compare it with the real distribution obtained by the SK . Also, we car ... More
Presented by Prof. Eiichi KONISHI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 107 (6A)
VERITAS employs a 12m segmented mirror and pixellated photomultiplier tube camera to detect the brief pulse of Cherenkov radiation produced by the extensive air shower initiated by a cosmic high-energy gamma ray. The VERITAS data acquisition system consists of a 500 Mega-Sample-Per-Second custom-built flash ADC system, which samples the Cherenkov light pulse every 2 nanoseconds. The integrate ... More
Presented by Dr. Peter COGAN on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 140 (7B)
The GRAPES-3 experiment observes extensive air showers using a high-density array of scintillators and a large area tracking muon detector. The array consists of 300 scintillation detectors (each 1m^2 in area) and 16 modules of muon detectors having a total area of 560m^2. Good angular resolution of the array is a key requirement for detection of point sources of gamma rays. For this purpose w ... More
Presented by Mr. Akitoshi OSHIMA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.1 Board #: 028 (2A)
The striking alignment effect detected earlier in gamma-hadron stratospheric STRANA superfamily is supplemented here by analysis of the arrangement of all particles in the central area of the family. It showed the evident anisotropy in the lateral distribution of these particles confirming a coplanar scatter effect in the interaction.
Presented by Dr. Vladislav OSEDLO on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.4.1
The compression ratio of the solar wind termination shock (TS) is an important parameter when studying the modulation of the anomalous component in the vicinity of the TS. An aspect that has been mainly overlooked is the inclusion of the latitude dependence of the compression ratio in modulation models. We present a theoretical study of the modulation effects of the latitude dependence o ... More
Presented by Prof. Marius POTGIETER
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 099 (5B)
The atmosphere is a vital component of the detector in an atmospheric Cherenkov telescope. In order to understand observations from these instruments and reduce systematic uncertainties and biases in their data it is important to correctly model the atmosphere in simulations of the extensive air showers they detect. The Very High Energy Telescope Array (VERITAS) is a system of 4 such telesco ... More
Presented by Dr. Michael DANIEL on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 115 (6A)
We will talk about slow control system of Ashra (All-sky Survey High Resolution Air-shower detector) experiment. As the name shows, it is an experiment observing fluorescence and Cherenkov light yielded by cosmic rays, which has very wide FOV (80% of 2 pi str) and a few arc-min optical resolution. In addition to cosmic ray detection, it is able to observe star (especially transient objects ... More
Presented by Mr. Akira OKUMURA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 114 (6A)
The mirror facets on the VERITAS telescopes, which are of Davies-Cotton design, are aligned with the telescope axis in the horizontal position using a laser projector at the radius of curvature. The instrument used will be described. The mechanical design of the Optical Support Structure permits some gravitational slumping with elevation which can be counteracted by bias alignment (deliberat ... More
Presented by J. TONER on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.1 Board #: 188 (10A)
We have proposed the CALET(CALorimetric Electron Telescope) mission to observe galactic electrons and gamma rays on ISS/JEM. In this paper we present the measurements of long-term and short-term variations of electron intensities in the helisphere. Galactic electrons of 1-100GeV energy range mostly have negative charges and the spectrum largely varies with solar activities. Thus we exp ... More
Presented by Dr. yoshiko KOMORI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.4 Board #: 168 (8B)
A comparative study of tri-diurnal anisotropy of Cosmic Ray intensity data has been performed for Deep River neutron monitoring station on geo magnetically 60 quietest days, 120 quiet days and all days during 1992-94. Histographic plots of percentage of occurrence of days for Phase (hrs) in a definite interval reveals that Phase is maximum in the interval of 0 to 2 hrs directions during t ... More
Presented by Mr. Mahendra RICHHARIA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2 Board #: 163 (8B)
Systematic correlative studies have been performed since long to establish a significant relationship between cosmic ray intensity and different solar/heliospheric activity parameters and study is extended to recent solar cycle 23. In the present work yearly average of sunspot number (Rz), interplanetary magnetic field (B) have been used to correlate with yearly average cosmic ray intens ... More
Presented by Dr. SUDHIR KUMAR SHRIVASTAVA
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.1 Board #: 037 (2B)
Utilizing the Gaisser parameterization of the differential vertical muon intensity and propagating the spectrum underground according to the statistical ionization and radiative muon energy losses, it is possible to calculate the underground muon intensity Crouch curve. In addition it is feasible to refine the spectral index of the Gaisser parameterization by minimizing the deviation from the ... More
Presented by Dr. Jeffrey DE JONG on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.4 Board #: 020 (1B)
We calculate the cosmic ray muon flux at ground level using the model of primary cosmic ray spectra suggested by Zatsepin and Sokolskaya. The model supposes contributions to the cosmic ray flux of three classes of sources - the shocks from exploding stars, nova and supernova of different types. The model is supported by the new data obtained in the ATIC-2 balloon experiment. Present ... More
Presented by Alexander PANOV on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.3 Board #: 081 (4B)
The balloon-borne ANITA neutrino telescope successfully launched from McMurdo Station, Antarctica during the 2006-2007 austral summer. In this paper we present ongoing studies of the energy resolution and system response of the ANITA detector, which provide an excellent test bed for validating the ANITA Monte Carlo, and will be of great interest if ANITA discovers signal events. While ... More
Presented by D. GOLDSTEIN on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 118 (6B)
VERITAS is an array of four identical telescopes designed for detecting and measuring astrophysical gamma rays with energies in excess of 100 GeV. Each telescope uses a 12 m diameter mirror to collect Cherenkov light from air showers initiated by the incident gamma rays and direct it onto a `camera' comprising 499 photomultiplier tubes (PMTs) read out by flash ADCs. We describe here calibratio ... More
Presented by Prof. David HANNA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.4
The time variation of the chaotic feature of the energy series of cosmic rays shows a periodic behaviour with the rotation of the earth. The periods are 1.0day and 1.3day. The energy series of cosmic rays are evaluated by the formula of Nishimura-Kamata-Greissen. The chaotic feature is found by the correlation dimension analysis and Lyapnov exponent analysis. The periods mean that the ch ... More
Presented by Dr. Soji OHARA
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.5 Board #: 056 (3B)
Solid state nuclear track detectors (SSNTD) are useful for studying heavy ion abundances in cosmic rays at mountain altitudes because of their light weight and certain Z/Beta detection thresholds which automatically eliminates low Z background. In our work we are using a particular brand of overhead projector (OHP) films which has a very high detection threshold of Z/Beta > 140 and so ar ... More
Presented by Dr. Swapan K SAHA
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2 Board #: 192 (10A)
Past works suggest the existence of several periodicities in comic ray data. Nevertheless, the reliability of the obtained periods is not often faced. In this paper, neutron monitor and IMP data were analysed by using the Fast Fourier Transform and Wavelet techniques to determine the reliability of each identified medium- and long-term periodicity. Moreover, their relevance is analysed along ... More
Presented by Dr. Monica LAURENZA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.3 Board #: 040 (2B)
Following the terminology adopted by Supe-Kamiokande, Fully Contained Events are observed in the electron-neutrino which result in the cascade shower for high energy neutrino astrophysics project, such as NT200, AMANDA etc., while muon-neutrino event re observed as Partially Contained Events. Fully Contained Events are essentially only source by which we could extract the reliable inform ... More
Presented by Prof. Akeo MISAKI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 131 (7A)
The problem of identifying gamma ray events hidden in charged cosmic ray background (so called hadrons) in Cherenkov telescopes is one of the key problems in VHE gamma ray astronomy. In this contribution, we present a novel approach to this problem by implementing different classifiers relying on the information of each pixel of the camera of a Cherenkov telescope, rather than using Hilla ... More
Presented by Ms. Raquel DE LOS REYES on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.3 Board #: 024 (2A)
Several candidate neutrino sources manifest variable electromagnetic emission, often with burst-like behaviour. It is interesting to consider that the neutrino emission from such sources could have similar time character. In the context of the so called multi-messenger approach, information from high energy neutrinos and different electromagnetic wavelengths (e.g., high gamma-rays) is combine ... More
Presented by Dr. Elisa BERNARDINI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.3 Board #: 046 (3A)
Theoretical predictions for neutrino fluxes indicate that km3 scale detectors are needed to detect certain astrophysical sources. The three Mediterranean experiments, ANTARES, NEMO and NESTOR are working together on a design study, KM3NeT, for a large deep-sea neutrino telescope. A detector placed in the Mediterranean Sea will survey a large part of the Galactic disc, including the Galac ... More
Presented by Mr. damien DORNIC on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2 Board #: 200 (10B)
An analysis of the solar magnetic field strength (B(nT)) was based on the temporal evolution of the minimum (Bmin) values in relation to the maximum (Bmax) values of the 300-year data series. Three results seem of particular significance. A two-step cycling mode is exhibited by the absolute values of Bmax and Bmin. The ratios of Br = (Bmax-Bmin)/(Bmax+Bmin) can be defined as the dimen ... More
Presented by Dr. Gisela DRESCHHOFF on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.4.3 Board #: 183 (9B)
Observations of cosmic-ray helium energy spectra provide important constraints on cosmic ray origin and propagation. However, helium intensities measured at Earth are affected by solar modulation, especially below several GeV/nucleon. Observations of helium intensities over a solar cycle are important for understanding how solar modulation affects galactic cosmic ray intensities and for sepa ... More
Presented by Dr. Georgia DE NOLFO on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2
The Maunder minimum (1745-1715) is a special period of extremely quiet Sun with almost vanishing sunspots. On the other hand it is known from measurements of cosmogenic isotope 14C in tree-rings that cosmic rays were cyclicly modulated during that period, but with the dominant 22-year period. Using a numerical model including the drift effect of the wavy heliospheric current sheet we simulate ... More
Presented by Dr. Usoskin ILYA
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.3 Board #: 070 (4A)
For energies less than ~3 GeV/n, the Cosmic Rays Antideuteron component due to spallation becomes negligible for kinematic reasons and the detection of even a single antideuteron would strongly suggest the existence of new sources, like neutralino Dark Matter. The AMS-02 experiment, on board of ISS for a long duration mission (3 years), thanks to its large acceptance (~ 0.5 m2 sr) and it ... More
Presented by Dr. Francesca GIOVACCHINI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.5 Board #: 076 (4B)
One of the severe limitations in detecting neutrino signals from nuclear reactors is that the copious cosmic ray background imposes the use of a time veto upon the passage of the muons to reduce the number of fake signals due to muon-induced spallation neutrons. For this reason neutrino detectors are usually located underground, with a large overburden. However there are practical limitations ... More
Presented by Dr. Edgar CASIMIRO LINARES on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2 Board #: 197 (10B)
We report results of cosmic-ray muon flux measurements in the Belgrade low- level laboratory (geographic latitude 44051'N, vertical geomagnetic rigidity cut-off 5.3GV). Continuous measurements are performed from 2002 to 2006 at ground level (78m a.s.l) and in the underground low-level laboratory (25m.w.e). At the ground level the average muon flux is found to be 1.6(1) x 10-2 s-1cm-2 and ... More
Presented by Dr. PRODANOVIC
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.5 Board #: 077 (4B)
The Zero Degree Detector (ZDD) is a new instrument that has been used in accelerator exposures to measure the angular dependence of secondary particles produced in fragmentation experiments. The ZDD uses two identical layers of pixelated silicon detectors that make coincident measurements over the active area of the instrument. The angular distribution of secondary particle produced in n ... More
Presented by Dr. Mark CHRISTL on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.5
A Nemo tower prototype, composed of 4 floors, has been recently deployed off the Sicily coast. This contribution aims at explaining the concepts underlying the communication link design going over the whole data acquisition and transport from the front-end electronics, with signal digitization and transmission, to the module which gathers four front-end boards and sends data on-shore throu ... More
Presented by Dr. Fabrizio AMELI
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.2 Board #: 078 (4B)
Both, Super-Kamiokande-I and SNO have reported a day night asymmetry that, after statistics and systematics are accounted for, is consistent with zero. Nevertheless, the Kamiokande values of 2.1% is sizable and, at least in sign, consistent with theoretical expectations. Taking into account in a simplified, yet realistic way the internal structure of the Earth, we present new analytical and nu ... More
Presented by Dr. Daniel SUPANITSKY on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.3 Board #: 067 (4A)
The unknown flux of prompt atmospheric neutrinos presents a challenging background to searches for extra-terrestrial neutrinos in high-energy detectors. Uncertainties in this flux will weaken the power of the detector to place constraints on other expected signals. A new likelihood analysis, using the full information present in event arrival directions and energy will be presented, which ... More
Presented by Gary HILL on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 121 (6B)
Recently, ground-based very high-energy gamma-ray astronomy achieved a remarkable advancement in the development of the observational technique for the registration and study of gamma-ray emission above 100 GeV. Construction of telescopes of substantially larger size than the currently used 12 m class telescopes can drastically improve the sensitivity of ground-based detectors for gamma rays o ... More
Presented by Dr. Alexander KONOPELKO on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 102 (5B)
The night sky light is one of the major components of background for imaging air Cherenkov telescopes. It disturbs images of air shower and makes both the gamma/hadron separation and the angular resolution worse. For example, The CANGAROO-III electronics consists of charge ADCs and multi-hit TDCs. In using charge ADCs, we have to delay the signal from PMTs until the trigger signal input to ADC ... More
Presented by Mr. Taku MIZUKAMI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.1 Board #: 034 (2B)
There are small differences in both ionization energy loss and catastrophic energy loss between positive and negative muons, which are usually neglected in most Monte Carlo simulations. These small differences can be amplified when measuring the charge ratio underground, where the total energy loss between the surface and the measurement is significant. Calculations of these effects fo ... More
Presented by Dr. Maury GOODMAN on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.3
The lightest neutralino in SUSY models is a good candidate for dark matter of the universe. In the large tan beta region of SUSY models, signals for direct and indirect search experiments can be enhanced due to neutral Higgs exchange diagrams. On the other hand, the same digram can affect Bs-->mu mu and may violate the upper bound from Tevatron. I discuss the interplay of these observabl ... More
Presented by Prof. Pyungwon KO
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.1 Board #: 162 (8B)
There are two types of high-speed solar wind streams classified in two categories: coronal hole associated and flare generated streams. These two types of streams are classified in two categories base on magnetic field and solar wind plasma parameters. We studied the dependence of cosmic ray depressions due to high-speed solar wind streams during low amplitude days. Cosmic ray intensity ... More
Presented by Dr. REKHA AGARWAL MISHRA
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7
Vela is the brightest pulsar known in the GeV gamma ray range, yielding a clear signal in less than a day of observations with the Large Area Telescope (LAT). The striking pulsed signature provides a rich opportunity to compare the real gamma ray response of the GLAST LAT to expectations from the highly-detailed Monte Carlo detector simulations. This is critical because all flux and spectral m ... More
Presented by Mr. Johann COHEN-TANUGI
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2
The modulation in cosmic ray intensity is observed due to long-term and short- term variation in solar activity. The concept of multi-parametric modulation of CRI may play an important role in the study of long-term modulation of CRI. Keeping in view the said idea/concept, we have tried to investigate the combined effect of a set of two SA parameters in the long-term modulation of CRI. Fo ... More
Presented by Dr. V.K MISHRA
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.4 Board #: 002 (1A)
Energy spectra of hadron cascade showers produced by the cosmic ray muons travelling through water and the muon integral spectra underwater at the depth up to 4 km are calculated with two models of muon inelastic scattering on nuclei, the recent hybrid model (two-component, 2C) as well as the well-known generalized vector-meson-dominance (GVMD) model for the comparison. The 2C model involv ... More
Presented by Prof. Akeo MISAKI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.1 Board #: 178 (9A)
The COSPIN/KET experiment on board the Ulysses spacecraft has been observing the flux of 3-30 MeV and also higher energy electrons in the inner heliosphere (radial distances > 5.2 AU) since its launch in 1990. These observations have indicated the presence of low-energy electrons with a strong anisotropy off the equatorial plane as far as 2.2 AU from Jupiter. This was observed during Uly ... More
Presented by Prof. Marius POTGIETER on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.1 Board #: 181 (9B)
We propose models which generalize the differential D(E) spectra of galactic (GCR) and anomalous cosmic rays (ACR) during the 11-year solar cycle. The models take into account the cosmic ray (CR) modulation in the Heliosphere. We describe the connection between solar activity variation and the values of model parameters. Our analyses show that the contribution of GCRs and ACRs to the io ... More
Presented by Ms. Marusja BUCHVAROVA
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 150 (8A)
In this contribution we discuss the possibility of using the observations by GLAST of standard gamma sources, as the Crab Nebula or Vela and some selected AGNs, to calibrate the Imaging Air Cherenkov detectors and improve their energy resolution. Results of the calibration technique can possibly be used to discriminate between VHE gamma-rays emitted by the Nebula and by the inner pulsar ... More
Presented by Dr. Denis BASTIERI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.3 Board #: 068 (4A)
Extremely high energy (EHE) cosmic rays are expected to interact with cosmic microwave photons and generate EHE neutrinos (>10PeV). The IceCube telescope can detect the EHE neutrinos due to its large effective volume, although the expected flux is much lower than the huge flux of atmospheric background muons at lower energies. Therefore, reconstruction of the track geometry and especially t ... More
Presented by Dr. David BOERSMA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.4 Board #: 044 (3A)
The IceCube neutrino observatory, currently under construction at the South Pole, offers a novel environment to search for particles beyond the Standard Model. With IceCube nearly 20% complete it is currently the largest neutrino telescope. The large instrumented volume and relatively clear glacial ice allows for the improvement of detection limits (in the absence of discovery) on many types o ... More
Presented by Dr. Alexander OLIVAS on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 122 (6B)
As described in a paper (S.Torii et al) of this conference, CALET is a versatile detector for exploring high energy universe by observing gamma rays (>20 MeV), electrons (>GeV) and other charged particles (>100GeV). It is planned to be on board the JEM (Japanese Experiment Module, Kibo) of the International Space Station. We study its basic performance by M.C simulations. Th ... More
Presented by Prof. katsuaki kasahara KASAHARA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.4 Board #: 082 (4B)
Several experimental works demonstrate the possibility of observation of shadows of the Moon and the Sun for the mean energy of primaries higher than 1 TeV. Calculations are presented to demonstrate the feasibility of Moon shadow observations for mean primary energies in the region 0.5-1 TeV in a muon detector operating under the Pyramid of the Sun at Teotihuacan, Mexico. Due to the relatively ... More
Presented by Dr. Varlen GRABSKI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.5 Board #: 074 (4B)
The South Pole Acoustic Test Setup (SPATS) has been built to evaluate the acoustic characteristics of the Antarctic ice in the 10 to 100 kHz frequency range so that the feasibility and specific design of an acoustic neutrino detection array at South Pole can be evaluated. SPATS consists of three vertical strings that have been deployed in the upper 400 meter of the Antarctic ice cap in Jan ... More
Presented by Ms. Freija DESCAMPS on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.3
The production of charmed hadrons (D^{+}, D^{-}, D^{0}, \bar{D}^{0}, \Lambda_{c}^{+}, \bar{\Lambda}_{c}^{-}) in pp collision as a function of \sqrt{s}, x_{F}, p_{\perp} and p_{\perp}^{2} have been studied in the framework of the QGSJET model. The charmed hadrons are considered as the potential sources of prompt lepton's fluxes in cosmic rays. So in this context, the study of the charmed h ... More
Presented by Mr. Umananda DEV GOSWAMI
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 123 (6B)
VERITAS is a new atmospheric Cherenkov imaging telescope array to detect very high energy gamma rays above 100 GeV. The array is located in southern Arizona, USA, at an altitude of 1270m above see level. The array currently consists of four 12 m telescopes, structurally resembling the Davis-Cotton design of the Whipple 10 m telescope. The VERITAS focal plane instruments are equipped with ... More
Presented by Dr. Tomoyuki NAGAI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 149 (8A)
High-energy gamma-ray sources are inherently nonthermal, multiwavelength objects. With the launch of the Gamma-ray Large Area Space Telescope (GLAST) in late 2007, the GLAST Large Area Telescope (LAT) Collaboration invites cooperative efforts from observers at all wavelengths. Among the many topics where multiwavelength studies will maximize the scientific understanding, three stand out. (1) ... More
Presented by Dr. Jennifer CARSON on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 155 (8A)
The Gamma ray Large Area Space Telescope (GLAST) is the next-generation high energy gamma-ray astronomy mission, scheduled for launch in Fall 2007. The observatory comprises two instruments. The Large Area Telescope (LAT) will survey the sky in the energy range from 20 MeV to >300 GeV, while the GLAST Burst Monitor (GBM) will monitor gamma-ray bursts and other transients in the 10 keV to 25 M ... More
Presented by Mr. JOHANN COHEN-TANUGI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.3 Board #: 165 (8B)
The spatial distribution of galactic cosmic rays in the heliosphere at solar maximum of Cycles 21, 22 and 23 are studied using a one dimensional model of the cosmic ray transport equation. We investigated the radial intensity gradients from 1 AU to the distant heliosphere and interpreted the data from IMP8, Voyagers 1/2, Pioneer 10 and balloon experiment BESS. In our model we considered ... More
Presented by Oscar G. MORALES-OLIVARES on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.5 Board #: 152 (8A)
We use a diffusive model for the propagation of Galactic cosmic rays to estimate the charged meson production in interactions with protons of the interstellar medium. Cosmic ray nuclei from proton to iron are considered and the corresponding contribution to the neutrino secondary flux produced as a result of spallation is also estimated. The contribution from nearby Galaxies to the all sky neu ... More
Presented by Cinzia DE DONATO on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 141 (7B)
GAW proposes a new approach for the detection and measurement of the Cherenkov light produced by GeV/TeV gamma rays traversing the Earth atmosphere which imposes specific requirements on the electronics design. The focal surface of the GAW telescope consists of a matrix of multi-anode photomultipliers. The large number of active channels (of the order of 104) makes it basically a large UV sens ... More
Presented by Pedro ASSIS on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 129 (7A)
We propose to provide a gamma-ray burst monitor (GBM) for the CALET mission to monitor gamma-ray bursts (GRBs) simultaneously with the CALET main detector. The major purpose is to derive a wide-band energy spectrum of GRB over an unprecedented 9 decades of energy (from a few keV to 10 TeV) in combination with the CALET tower detector. Hence it is desirable to have the CALET-GBM covering an ene ... More
Presented by Dr. Kazutaka YAMAOKA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 097 (5B)
Charged Cosmic Rays are a huge background in any IACT measurement. Traditional data analysis methods involve variables that try to characterize the shape of the shower 2D pattern at the IACT focal plane. The Hillas parameters are, in this context, widely used. In this contribution an innovative method based on 3D variables, the angles and the distances (impact parameters) in space between ... More
Presented by Prof. Mario PIMENTA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 105 (5B)
Imaging Air Cherenkov Telescopes (IACTs) detect the Cherenkov light flashes of Extended Air Showers (EAS) triggered by VHE gamma-rays impinging on the Earth's atmosphere. Due to the overwhelming background from hadron induced EAS, the discrimination of the rare gamma-like events is rather difficult, in particular at energies below 100 GeV. The influence of the Geomagnetic Field (GF) on t ... More
Presented by Mr. S.C. COMMICHAU on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 151 (8A)
The High Altitude Water Cerenkov detector HAWC will be a powefull instrument to survey the TeV sky. Mexico has proposed to locate this experiment in the Parque Nacional Pico de Orizaba, between Citlaltepetl and Tliltepetl, host of the Large Millimeter Telescope (LMT). The region has a sizeable technical infrastructure related to the LMT and we recently studied a 4100m location in terms of i ... More
Presented by Dr. Alberto CARRAMINANA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.1 Board #: 041 (2B)
Perturbative QCD predicts that there should be a significant flux of muons with high transverse momentum (p_T) produced in primary interactions of high-energy cosmic-rays. These muons arise from the semileptonic decays of heavy quarks, and from the decays of high p_T kaons and pions produced in jets. These muons can be useful to study the cosmic-ray composition in a pQCD framework. ... More
Presented by Dr. Spencer KLEIN on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 153 (8A)
We have developed a hybrid photo-detector (HPD) for the Ashra detector. The HPD consists of a 6-inch electron tube and a multi-pixel silicon detector followed by trigger decision ASIC circuits. The advanced features of the silicon detector are as follows: 1. high resolution with 64 x 64 channels using bump bonding technique 2. high gain due to a thin dead layer and a large effective area ... More
Presented by Dr. Masataka MASUDA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2 Board #: 158 (8B)
The long-term variation (modulation) of CR intensity is not exactly anti-parallel to sunspot activity. In odd cycles, there is a large hysteresis loop (difference in the evolution during the rising and falling phase of solar activity). In even cycles, the loop is narrow. So far, only data for two odd cycles (cycle 19 and 21) and two even cycles (20 and 22) were available and the above patt ... More
Presented by Dr. RAJARAM KANE on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.1 Board #: 173 (9A)
Peculiarities in distribution of the Jovian electrons along the Earth's orbit based on an extended set of observational data are investigated. It is shown that the maximum in the electron intensity appears 243 days after the Earth-Jupiter opposition. It corresponds to the IMF field time simultaneously covering the Jupiter and the Earth. Through the charged particle flux the Jupiter forms 3 ... More
Presented by Dr. Vladislav TIMOFEEV on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.5 Board #: 124 (6B)
IceCube is a 1 km^3 neutrino observatory now being built at the South Pole. In addition to its larger size, IceCube is also designed to have smaller systematic errors than its AMANDA predecessor. IceCube performance for showering ('cascade'-like) events has been studied with LED and laser light sources. The detector resolution for cascade position, energy and direction has been studied ... More
Presented by Dr. Joanna KIRYLUK on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.1 Board #: 060 (3B)
The calibration of the surface air shower array of IceCube - IceTop is based on identifying and understanding the muon response of each IceTop tank. Special calibration runs are carried out throughout the year and are supplemented with austral season measurements with tagging telescope for vertical muons. The vertical equivalent muon (VEM) charge value of each tank is determined and monitored ... More
Presented by Dr. Levent DEMIROERS on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.1 Board #: 014 (1B)
Small air showers that trigger single or several IceTop stations usually have one or several muons with energy high enough to reach the IceCube in-ice detector. In this work, we first use the coincident events to calibrate the timing resolution between and within the two detectors. Using muons tagged by IceTop single station triggers, which usually contain a single high energy muon, we also cr ... More
Presented by Dr. Thomas GAISSER on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.4 Board #: 064 (4A)
The Antarctic Impulsive Transient Antenna (ANITA) experiment may be the first experiment to identify astrophysical neutrinos of energy greater than 10^18 eV through the detection of radio Cherenkov pulses emitted by neutrino-induced particle showers in the Antarctic ice. A Monte Carlo simulation has been developed to determine the sensitivity and improve the event reconstruction capabilities o ... More
Presented by Brian MERCURIO on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.4 Board #: 050 (3A)
In neutrino astronomy, glacial ice or deep ocean water are used as detector media. Typically, neutrinos are recognized by distinguishing charged particles generated in neutrino interactions from atmospheric muons, using in situ detectors recording time distributions and fluxes of faint photon fields of Cherenkov radiation. The IceCube collaboration has developed an empirical model descri ... More
Presented by Mr. Johan LUNDBERG on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 143 (7B)
The Large Area Telescope (LAT) is one of the two instruments onboard the Gamma-ray Large Area Space Telescope (GLAST), the next generation high-energy gamma-ray telescope, to be launched in Fall of 2007. It is comprised of sixteen identical towers in a four by four grid, each tower containing a silicon tracker and a CsI calorimeter that together will give the incident direction of the pair-con ... More
Presented by Mrs. Claudia LAVALLEY on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.3 Board #: 021 (1B)
Under the assumption the Neutralino as lightest supersymmetric particle being the DM particle, studies of the evolution of Super Massive Black Holes expected in the center of most galaxies predict the existance of some 100-1000 Intermediate Mass Black Holes (IMBH) also in our galaxy [Bertone et al. 2005]. Since IMBHs did not suffer major merging and barionic accretion, they can have a very ... More
Presented by Dr. Michele DORO on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.4 Board #: 199 (10B)
Data on the hourly means of cosmic ray density and anisotropy derived by the GSM method over the 1957-2006 are introduced in to MySQL database. This format allowed an access to data both in local and in the Internet. Using the realized combination of script-language Php and My SQL database the Internet project was created on the access for users data on the CR anisotropy in different for ... More
Presented by Dr. Viktor YANKE, Mr. Aliaksandr ASIPENKA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.4.1 Board #: 169 (9A)
Ion acceleration and Alfven waves excitation at the interplanetary shocks is studied within the quasilinear approach. Numerically calculated spectra of ions and Alfven waves are compared with experimental data. It is shown that calculations are well consistent with the existing measurements.
Presented by Prof. Evgeny BEREZHKO on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.3
Ulysses, launched in October 1990, now is in its third out-of-ecliptic orbit. The situation now is sharply distinct from that during the second orbit in maximum of solar activity and reminds a situation during the first orbit when solar activity was also low, but in contrast to the first orbit we are now in the heliosphere with other polarity of the total solar magnetic field. The Kiel Ele ... More
Presented by Dr. Eugenia EROSHENKO
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.4
We study the propagation of energetic muons produced by ultra high energy cosmic rays which could penetrate to the cavern of the CMS (Compact Muon Solenoid) tracing detector. The present work is based on our previous simulation proposed by Mahrous et al. [2005]. We have improved this model by (1) eliminating the ambiguity via adding Landau-Pomeranchuk-Migdal effect to the Monte Carlo cod ... More
Presented by Prof. Mohamed SHERIF
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 126 (6B)
As a calibrated laser pulse propagates through the atmosphere, the Rayleigh scattered light intensity arriving at the VERITAS telescopes can be calculated precisely when atmospheric conditions are good. This technique is originally developed for the absolute calibration of ultra high energy cosmic ray fluorescence telescopes but is also applicable to imaging atmospheric Cherenkov telescopes. ... More
Presented by Ms. Michelle HUI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2
Galactic cosmic rays in the energy range from several hundred MeV to tens of GeV are subjected to heliospheric modulation, which charges their intensity and spectrum during 11-year cycle. Since the drift modulation processes are charge/polarity dependent, the 22-year solar magnetic field cycle is visible in cosmic ray data, e.g. in the different shapes of maxima of galactic cosmic rays i ... More
Presented by Dr. Sampati kumar MISHRA
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 136 (7A)
High-peaked BL Lacertae objects are the prime source population for studies with Cherenkov telescopes. It is obvious that monitoring observations of strong blazars are orthogonal to the mission of the larger Cherenkov telescopes, as H.E.S.S. and MAGIC with their discovery potential for new sources (luminosity function, redshift distribution). We propose to set up a Cherenkov telescope with lo ... More
Presented by Markus MEYER on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2
A systematic study has been performed to derive a relationship between cosmic ray intensity variation and solar wind velocity. Pressure and temperature corrected Kiel neutron Monitor data have been used to study the isotropic variation of cosmic ray intensity during the period 1986 to 2006. It has been found that cosmic ray intensity shows significant changes with various associated sola ... More
Presented by Dr. Chandra Mani TIWARI
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2
The Poatina, Tasmania, underground muon observatory has operated since 1972, at a mean energy of response about 1.2 TeV. The observations over this period are presented and compared with observations from other experiments.
Presented by Dr. John HUMBLE
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 130 (7A)
Detailed Monte Carlo simulations of possible configurations for a future large-scale installation of Imaging Atmospheric Cherenkov Telescopes, the CTA (Cherenkov Telescope Array), have been carried out. This includes a full treatment of shower fluctuations, night sky background, registration of the signal and reconstruction of the registered showers. Although not representing a detailed desig ... More
Presented by Dr. Thomas SCHWEIZER on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.2 Board #: 079 (4B)
The Main Injector Neutrino Oscillation Search (MINOS) experiment has continued to collect atmospheric neutrino events while doing a precision measurement of NuMI beam nu_mu disappearance oscillations. The 5.4 kton iron calorimeter is magnetized to provide the unique capability of discriminating between nu_mu and nu_mu_bar interactions on an event-by-event basis and has been collecting atmosp ... More
Presented by Prof. Alec HABIG on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2 Board #: 184 (9B)
We propose a new approach to the modeling of the long period (11–year) variations of the Galactic Cosmic Ray (GCR) intensity based on the Parker’s transport equation. Besides very known four universal processes: convection, diffusion, drifts due to the gradient and curvature of the regular Interplanetary Magnetic Field (IMF) and on the warped heliospheric neutral sheet and changes of ... More
Presented by Dr. Marek SILUSZYK
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2 Board #: 174 (9A)
We discuss the improving of the semi-empirical model of cosmic ray (CR) modulation proposed by us previously. In order to describe the long-term variations with more complete reflection in the CR modulation of the complex interaction of global and local solar magnetic fields it has been proposed to introduce into the model the next characteristics: the solar magnetic field polarity, the integr ... More
Presented by Dr. Raisa GUSHCHINA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.1 Board #: 029 (2A)
A magnetic detector such as MINOS which is measuring the sign of muons has to deal with issues of bending, which depend on the magnetic field configuration, and multiple scattering, which depends on the amount of material which is traversed. Above some momentum which depends on these factors, the momentum cannot be resolved. Issues related to measurement of the muon charge ratio in the ... More
Presented by Dr. Maury GOODMAN on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 116 (6B)
In the analysis of Imaging Air Cerenkov Telescope (IACT) data, offset and/or extended source observations require more sophisticated schemes for determining the presence and statistical significance of any excess gamma ray signal than the standard Li and Ma On-Off technique that has been conventionally used in the analysis of point sources. Although arrays of multiple telescopes have muc ... More
Presented by Dr. Glenn SEMBROSKI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.1 Board #: 007 (1A)
High-statistics data collected with Russian-Italian coordinate detector DECOR are analyzed. Precise measurements of muon angular distributions in zenith angle interval from 20 to 90 degrees have been performed. In total, more than 160 million muons are selected. Dependences of the absolute integral muon intensity on zenith angle for several threshold energies ranging from 1.7 GeV up to 7 GeV a ... More
Presented by Dr. Igor YASHIN on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.3 Board #: 065 (4A)
The balloon-borne ANITA high energy neutrino telescope successfully launched on December 15, 2006 and flew for a little less than 35 days. Its primary mission is to detect astrophysical neutrinos with energies in excess of 10^19 eV. Neutrino interactions in Antarctic ice produce short, intense radio pulses that are detected by ANITA at distances as large as 600 km. The usual detection scena ... More
Presented by Prof. Steven BARWICK on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 113 (6A)
Each of the VERITAS telescopes has 345 adjustable glass facets which were manufactured by D.O.T.I., Roundrock, Texas with slumping and grinding to get the optical figure. The facets were aluminized and anodized at the Whipple Observatory. The parameters (reflectivity, focal length and blur circle) were measured. The design specifications for focal length (12.00 m +/- 1%) and spot size (< 10 ... More
Presented by J. PERKINS on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.1 Board #: 053 (3B)
The MAGIC Collaboration operates the 17m imaging Cherenkov telescope on the Canary island La Palma. The main goal of the experiment is an energy threshold below 100 GeV for primary gamma rays. The new analysis technique (model analysis) takes advantage of the high resolution (both in space and time) camera by fitting the averaged expected templates of the shower development to the measured sho ... More
Presented by Mr. Daniel MAZIN on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.1 Board #: 177 (9A)
The heliospheric interface is calculated using a three-fluid hydrodynamic model. Using this approach the effects of different solar wind profiles, as they may occur during different levels of solar activity, on the heliospheric structure and the distribution of hydrogen and pickup ions are calculated self-consistently. We present a time dependent parameter study with respect to the solar w ... More
Presented by Dr. Stefan FERREIRA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 109 (6A)
The Milagro gamma-ray observatory is a water-Cherenkov detector capable of observing air showers produced by very high energy gamma-rays. The sensitivity and performance of the detector is determined by a detailed Monte Carlo simulation and verified through the observation of gamma-ray sources and the isotropic cosmic-ray background. Corsika is used for simulating the extensive air showers pr ... More
Presented by Mr. Vlasios VASILEIOU on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 108 (6A)
MAGIC-II, a two 17m telescope system, will start operating at La Palma in the fall of 2007. Its main goal is to improve the sensitivity in the stereoscopic/coincident operational mode. At the same time it will lower the analysis threshold of the currently running single MAGIC telescope. Results from the Monte Carlo simulations of this system will be discussed. A comparison of the two telescope ... More
Presented by Mr. Nepomuk OTTE on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 117 (6B)
The Very High Energy Telescope Array (VERITAS) is a system of four imaging Cherenkov telescopes located at the Fred Lawrence Whipple Observatory in southern Arizona. We present here results of detailed Monte Carlo simulations of the array response to extensive air showers. Cherenkov image and shower parameter distributions are calculated and show good agreement with distributions obtained from ... More
Presented by Dr. Gernot MAIER on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.5 Board #: 057 (3B)
Multi-prong tracks have been recorded in the polyethylene terepthalate (C10H8O4) solid-state nuclear track detector by exposing it to a 252Cf fission source. After etching with 6.25N NaOH solution at temperature 55±0.1 C, for four hours, two-prong to six-prong tracks along with single tracks were observed under the objective of an optical microscope. Cross section of fragmentation decre ... More
Presented by Dr. S DEY
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.1 Board #: 038 (2B)
We discuss the energy distribution of produced particles in multiple particle production empirically summarizing the available data, obtained by cosmic-ray and accelerator experiments, of charged particles and $\gamma$'s at high energies. Based on these data which are expressed by various quantities and by various variables at various rapidity ranges by respective experimental groups, we const ... More
Presented by Dr. Akinori OHSAWA
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.2 Board #: 004 (1A)
Data collected during the year 2006 by the first 9 strings of IceCube have been used to measure the energy spectrum of the atmospheric neutrino flux. Atmospheric neutrinos, an important scientific output by itself (for instance, to understand the high-energy hadronic interaction models), are also fundamental in order to check the performance of the detector and to estimate the background for ... More
Presented by Dr. Juan-de-Dios ZORNOZA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.1 Board #: 055 (3B)
A review of measurements of the muon energy spectra for different altitudes, height and directions performed with devices placed at various geomagnetic latitudes is presented. The theoretically motivated final fit to the existing experimental differential and integral data will be presented. The muon spectra and the muon charge ratio, defined as the ratio of positive to negative muon fluxes, a ... More
Presented by Prof. Janusz KEMPA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.2 Board #: 039 (2B)
The Main Injector Neutrino Oscillation Search (MINOS) long baseline experiment has been actively taking beam data since 2005, having already accumulated 2.6E20 protons-on-target. MINOS uses the most powerful neutrino beam currently in operation measured in two locations: a Near detector at Fermilab, close to beam production, and a Far detector, 735 km downstream, in Northern Minnesota. Alth ... More
Presented by Dr. Alexandre SOUSA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.3 Board #: 049 (3A)
One of the physics goals in SK-III is the observation of relic supernova neutrinos from the identification of their electron anti-neutrino component. Application of the delayed coincidence method benefits as a powerful tool in the selection of an electron anti-neutrino with largely reduced background. This selection is accomplished by detecting both a positron and a neutron created in the inv ... More
Presented by Dr. Hideki WATANABE on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.5 Board #: 071 (4A)
In 80th a new type of APDs with negative local feedback which significantly reduces the excess noise factor introduced by the avalanche process - the metal-resistive layer-semiconductor (MRS) APDs - were developed in INR (Moscow) by Sadygov et al. in the frameworks of the Soviet DUMAND program led by M.A. Markov. In 90th and during a few last years some new kinds of the Micro-pixel Aval ... More
Presented by Dr. Igor ZHELEZNYKH on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7
The Large Area Telescope (LAT) on board of the Gamma-ray Large Area Space Telescope (GLAST) aims to perform gamma-ray astronomy in the energy range 20 MeV to 300 GeV. GLAST will be launched at the fall of 2007, opening a new and important window on a wide variety of high energy astrophysical phenomena . The LAT consists of 16 identical towers in a four-by-four grid, each one containing a pai ... More
Presented by Dr. David PANEQUE
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.4 Board #: 027 (2A)
We have performed a study of the events recorded by NT detectors assembled in a large area and exposed for long time at a high altitude site where the flux of cosmic ray secondaries, especially neutrons, is very high. Simulations of the interactions in the surrounding materials and of the responses of the NT detectors have been carried out. The results are compared with the main features of t ... More
Presented by Dr. stefano CECCHINI
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.1 Board #: 036 (2B)
The 5.4 kT MINOS Far Detector (Fardet) has accumulated 45 million cosmic-ray induced muon tracks since it began operation in 2003. An analysis of the muon flux in the direction of the Moon and Sun, which both obscure a circular disc of similar radius as viewed from Earth, have revealed statistically significant deficits. The shadow of the moon has been used to establish the alignment and ... More
Presented by Eric GRASHORN on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 106 (6A)
We study the capability of the MAGIC telescope to observe under moderate moonlight. TeV gamma-ray signals from the Crab nebula were detected with the MAGIC telescope during periods when the Moon was above the horizon and during twilight. This was accomplished by increasing the trigger discriminator thresholds. No change is necessary in the high voltage settings since the camera PMTs were espec ... More
Presented by Dr. Emma OÑA-WILHELMI, Dr. Javier RICO on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2 Board #: 171 (9A)
The long-term experiment of the regular balloon cosmic ray monitoring in the Earth’s atmosphere has been carried out by Lebedev Physical Institute, RAS, Moscow, Russia, for almost 50 years (since July 1957) and still provides useful data on both galactic and solar cosmic rays. However there are some flaws in the standard method of data registration that sometimes hinder getting good data. To ... More
Presented by Dr. Mikhail KRAINEV on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.6 Board #: 145 (7B)
The Laser Interferometer Gravitational-Wave Observatory (LIGO) consists of Fabry-Perot Michelson interferometers designed to measure gravitational waves at frequencies between 10 Hz and 3 kHz. One potential noise source in this frequency range is the buildup and motion of surface charge on the optics, which can be generated through friction with air, contact with other materials, or int ... More
Presented by Dr. Dennis UGOLINI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.4 Board #: 175 (9A)
Recent observations of the Matsushiro deep underground muon telescope indicate that, the solar diurnal variation (after correcting for the Compton-Getting anisotropy due to the Earth's orbital motion) has a solar cycle variation and a 0.04\% wave extends to rigidities as high as several hundreds of GV during solar maximum. We construct a simple model to simulate the motion of high-rigidity par ... More
Presented by Dr. Jozsef KOTA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.5 Board #: 059 (3B)
We exposed three stacks of Polyethylene Terephthalate (PET) detectors each of thickness 100 micron and area 21cm X 30cm at Darjeeling, India (North East Himalayan Range), under an atmospheric pressure of 765 hPa. This particular brand (Desmat Century) of plastics is found to have a charge detection threshold (Z/beta) >140. These stack of detectors were kept in the open air for 182 days i ... More
Presented by Prof. S RAHA
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 138 (7B)
MAGIC, a 17m diameter Cherenkov telescope locating at the La Palma Canary island, is the biggest IACT (Imaging Atmospheric Cherenkov Telescope) in the world. For lowering the energy threshold and improving the sensitivity, the MAGIC collaboration is going to build a second telescope (MAGIC II), using a better sensitivity of Photomultipliers(PMT). Variety of measurements about different charact ... More
Presented by Mr. Ching-Cheng HSU on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.3 Board #: 035 (2B)
The IceCube Neutrino Observatory is currently under construction at the South Pole, Antarctica, and 22 strings (of 80) have so far been installed. The observatory is surrounding the AMANDA neutrino telescope, which is running since 2000. The combination of the AMANDA telescope and the Icecube strings will improve the sensitivity to neutrinos from Dark Matter annihilation. This paper will di ... More
Presented by Mr. Gustav WIKSTROM on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.1 Board #: 164 (8B)
A key problem of cosmic ray astrophysics is the explanation of measured parallel and perpendicular mean free paths in the heliosphere. Previous approaches used quasilinear theory in combination with simple turbulence models to reproduce heliospheric observations. Because of recent progress in transport and turbulence theory linear and nonlinear diffusion coefficients within an improved dynamic ... More
Presented by Dr. Andreas SHALCHI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.1 Board #: 085 (5A)
The studies of two and three particle correlations for the grey particles emitted in the interactions of of 12C, 16O, 28Si (4.5 A GeV/c), and 22 Ne (4.1 A GeV/c) projectiles with emulsion have been investigated in the pseudorapidity interval and azimuthal interval . The results showed the formation of hadronic or baryonic cluster which may reflect the sidward flow of nuclear matter.
Presented by Dr. sayed SALEH
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.3 Board #: 009 (1A)
In the structure of the Yakutsk installation complex to measure cosmic ray intensity there is a unique device - the ionization chamber of large size ASK-1. Such a chamber allows to investigate physical characteristics of ionization pushes i.e. events when ionization sharply increases. The effect is caused by the showers formed mainly by cosmic ray particles in the screen or in the ... More
Presented by Dr. Vladislav TIMOFEEV
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.4 Board #: 180 (9B)
We study the features of the power energy spectrum of the 27–day variation of the galactic cosmic ray intensity by neutron monitors experimental data for different epoch of solar activity in various polarity periods of solar magnetic cycles. It is recognized that, averagely, the power energy spectrum of the 27– day variation of the galactic cosmic ray intensity has tendency to be harder ... More
Presented by Dr. Agnieszka GIL on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 110 (6A)
We have been developing a gas time projection chamber for the imaging of gamma-rays between 0.3 - 50 MeV, the Three-Dimensional Track Imager (3DTI). The detector is being designed for use on satellite experiments for the imaging of astrophysical gamma-ray sources. Electrons produced by pair production or Compton scattering ionize the gas and these ionization electrons are detected by th ... More
Presented by Dr. Seunghee SON on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.5 Board #: 033 (2B)
The Milagro experiment observes the extensive air showers produced by very high energy gamma-rays impacting the Earth’s atmosphere. Milagro uses 898 Hamamatsu R5912 Photomultiplier Tubes. To complete our Monte Carlo simulations, we tested the photocathode uniformity of our PMTs. The main finding was that the PMT gain and detection efficiency are a function of the distance from the center of ... More
Presented by Mr. Vlasios VASILEIOU on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.2
The high end of the neutrino spectrum observable with the Super-Kamiokande experiment is seen as upward-going muons from nu_mu interactions in the rock surrounding the detector. Division of these neutrino-induced events into those which stop in the detector, those which cross the detector, and those with catastrophic energy losses creates three data samples, with typical parent neutrino energ ... More
Presented by Prof. Alec HABIG
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2 Board #: 186 (9B)
The solar activity has been propose as one of the main factors of the climatic variability. Also another type of processes, the biological ones, have been proposed as important factor in the climatic variation through the modification of the cloud albedo. In the present work we used the wavelet analysis to investigate the relation between the polar concentrations of Methane Sulphonic Aci ... More
Presented by Mr. Jaime Arturo OSORIO ROSALES on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.5 Board #: 062 (3B)
Powerful nanosecond light sources based on LED have been developed for using in astroparticle physics experiments. The light sources use either matrixes of ultra bright blue InGaN LEDs or new generation high power LEDs. It is shown that such light sources have light yield of up to 10**11 with very fast light emission kinetics. Described light sources are important for using in calibratio ... More
Presented by Mr. Bator SHAIBONOV on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.4 Board #: 072 (4A)
We present a study of the interaction of low energy electron neutrinos on nuclei that undergo beta decay. Remarkably, we found that in the limit of very low neutrino energy the product of the cross section times the neutrino velocity take values up to $10^{-42}$ cm$^2$ $c$ for some specific nuclei that decay via allowed transitions. The absence of an energy threshold and the value of the cros ... More
Presented by Dr. Alfredo Giuseppe COCCO on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.5 Board #: 052 (3A)
We are proposing the CALET (CALorimetric Electron Telescope) instrument for the observation of high-energy electrons and gamma rays at the Exposed Facility of the Japanese Experiment Module on the International Space Station (ISS). The CALET detector consists of an imaging calorimeter with scintillating fibers and tungsten plates, and a total absorption calorimeter with crystal scintillators. ... More
Presented by Dr. Kenji YOSHIDA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.1 Board #: 003 (1A)
The CORSIKA programme and specific Monte Carlo collision generators are employed in the interpretation of X-ray emulsion chambers data on super gamma ray families at mountain altitude (Chacaltaya, Kanbala, Pamir...) and in the stratosphere (Concorde, balloons). The consequences of measurement conditions(energy thresholds levels...) are detailed to extract common features for the ... More
Presented by Prof. JEAN-NOEL CAPDEVIELLE on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.4.1 Board #: 196 (10A)
Radial variations of quiet-time fluxes of ~1-30 MeV protons are examined at distances of 2-85 AU using Voyager 1-2 (LECP, CRS) and Ulysses (LET) data. Attention is focused on the solar cycle minima of 1985-87 and 1995-97. Gradient values calculated from particle fluxes show an increase between 30 and 70 AU during the recovery phases of galactic cosmic ray intensity. The energy spectra ch ... More
Presented by Prof. Yu.I. LOGACHEV on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.5 Board #: 063 (3B)
We explore the sensitivity of a neutrino detector employing strongly directional high gain antennas to detect the conversion of neutrinos in the 10^16 eV range in a mountain or the earth crust. The directionality of the antennas will allow both, the low threshold and the suppression of background. This technology would have the advantage that it does not require a suitable atmosphere as optic ... More
Presented by Mrs. Olga BRUSOVA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 128 (7A)
Today the Hybrid Photon Detector (HPD) is one of the few low light level (LLL) sensors that can provide an excellent single and multiple photoelectron (ph.e.) amplitude resolution. The recently developed HPDs from Hamamatsu with a GaAsP photocathode, namely the R9792U, provide a peak quantum efficiency (QE) of 55% and a pulse width of ~2 nsec. In addition, the afterpulsing rate of these t ... More
Presented by Mr. TakaYuki SAITO on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.4
A search for low velocity exotic particles is performed. The whole data set of L3+C events is analyzed, and the result is presented.
Presented by Dr. Xinhua MA
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.4 Board #: 161 (8B)
Abstract A detailed study has been conducted on the long-term changes in the semi- diurnal anisotropy of cosmic rays using the ground based Deep River neutron monitor data during significantly low amplitude anisotropic wave train events (LAEs) in cosmic ray intensity for the period 1981-94. It has been observed that the phase of the semi-diurnal anisotropy for majority of the LAE events ... More
Presented by Dr. RAJESH Kumar MISHRA
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.4
In order to perform the influence of solar activity parameters (Sun spot numbers SSN) on cosmic ray intensity (CRI), we have used six monthly averaged cosmic ray data from Oulu (Rc = 0.78Gv) and Rome (Rc = 6.32GV) neutron monitoring stations for three solar cycles. (21 - 23). The detailed analysis of hysteresis effect between SSN & CRI has been done. The area of hysteresis loops and time ... More
Presented by Dr. M.L. CHAUHAN
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.3 Board #: 045 (3A)
In this analysis 3329 neutrino events detected by AMANDA-II during the years 2000-2003 are analysed for anisotropies or unexpected structures in their arrival direction. The structures could arise due to the presence of a signal from many weak and therefore unresolved cosmic neutrino sources, extended sources or a few brighter sources. For the first time a technique, well known from the ana ... More
Presented by Jan-Patrick HÜLß on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.4 Board #: 042 (2B)
A search for neutron-antineutron oscillation, a |delta B| = 2 process predicted by L-R symmetric gauge theories, was undertaken using the 24.5 x 10^33 neutron-years of exposure in run one of Super-Kamiokande. When incorporating most major sources of systematic and statistical errors we calculate the upper limit on the oscillation lifetime of neutrons in oxygen to be 1.78 x 10^32 years at ... More
Presented by Prof. Kenneth GANEZER on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.3 Board #: 025 (2A)
The Antartic Neutrino Telescope AMANDA and its succesor IceCube can be used for searches for cosmic point sources of neutrinos with a wide range of energy. The highest of these energy bands spans from about 10^5 to 10^10 GeV. Several source models predict a significant neutrino flux in this part of the spectrum, for example from Active Galactic Nuclei. Since the interaction length of these neu ... More
Presented by Mrs. Elisa BERNARDINI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.3 Board #: 048 (3A)
The observation of high energy neutrinos would be a significant constraint for non thermal processes in astrophysical sources (active galactic nuclei, supernovae remnants…). Moreover it would also be the evidence for cosmic ray acceleration inside our galaxy. Recent precise measurements of the cosmic gamma-ray spectrum above 1 TeV with the High Energy Stereoscopy System (H.E.S.S.) inst ... More
Presented by Mr. rezo SHANIDZE on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.4
This paper presents the average sidereal anisotropy (SA) of sub-TeV galactic cosmic ray intensity observed with a two-hemisphere network (THN) of underground muon detectors over 15 years. The average SA confirms the conclusions derived from the initial 5-year data by THN, while the long-term observations allow us to examine modulations over the solar activity and magnetic cycles. The THN ... More
Presented by Prof. Kazuoki MUNAKATA
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.4 Board #: 170 (9A)
The sidereal daily variation is investigated by using the continuous observation data of ground and underground (7, 20 and 60 m w.e.) muon cosmic ray intensities for the 1972 to 2001 period. The results obtained are discussed in the light of the supposed sources of heliospheric and galactic origin.
Presented by Dr. Sardaana GERASIMOVA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.4 Board #: 080 (4B)
The balloon-borne ANITA neutrino telescope completed a successful 35-day flight during the 2006-2007 austral summer. The primary goal of ANITA is to search for evidence of ultra high-energy neutrinos (E > 10^19 eV) interacting in the Antarctic ice sheets. In this paper, we present preliminary results of the simulated sensitivity of ANITA, incorporating the actual flight path, geographic ... More
Presented by D. GOLDSTEIN on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 095 (5B)
TenTen is a proposed array of Imaging Atmospheric Cherenkov Telescopes (IACT) optimised for the gamma ray energy regime above 10 TeV. It will offer a collecting area of 10 km^2 above energies of 10 TeV. In the initial phase, a cell of 3 to 5 modest-sized telescopes, each with 10-20 m^2 mirror area, is planned for an Australian site. A possible expansion of the array would comprise many such c ... More
Presented by Mr. Victor STAMATESCU on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.3 Board #: 005 (1A)
A Tau lepton can be produced in a charged current interaction of cosmic ray tau neutrino with materials inside a mountain. If it escapes from mountain, it will decay and initiate a shower in the air, which can be detected by air shower fluorescence/Cerenkov light detector. A Monte Carlo simulation for CRTNT (Cosmic Ray Tau Neutrino Telescopes) detector near Mt. Balikun in Xinjiang, China ... More
Presented by Dr. J. LIU
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.4 Board #: 069 (4A)
Antarctic Ross Ice Shelf ANtenna Neutrino Array (ARIANNA) is a new concept of a large radio telescope which consists of 10,000 broadband antenna stations located on the surface of the Ross Ice Shelf in Antarctica. Primary goals of ARIANNA are to test the GZK (Greisen-Zatsepin-Kuzmin) neutrino production and to measure the neutrino cross-section near 100 TeV. We present here a Monte Carlo simul ... More
Presented by J. NAM on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.4
A Monte-Carlo simulation code SHINIE is developed from high energy neutrino experiments above or under ground. Initially development is for Earth-skimming tau neutrino experiment. Recent updates of muon and electron neutrinos enable this code to simulate all flavors of neutrinos. This talk will demonstrate the capability of SHINIE. We also point out an important method to study neutrino ... More
Presented by Prof. Minghuey Alfred HUANG
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.5 Board #: 051 (3A)
The WILLI calorimeter, installed in NIPNE Bucharest, is operated since several years for measuring low energy (E<1GeV) charge ratio of atmospheric muons, including its directional dependence. Recently a project was proposed to combine WILLI with a mini-array of 12 scintillators in order to measure muon charge ratio in EAS. This experiment could provide further information on shower develop ... More
Presented by Mr. Bogdan MITRICA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.4 Board #: 073 (4A)
Radio signals produced in ice by electromagnetic cascades with energies up to 10^15 eV have been calculated. Simulations of cascades were performed using the SIMEX Code System. The simulation results in the matrix form, which described the charge excess evolution, were used to calculate coherent Cherenkov radio field from electromagnetic cascades. Comparison with results received in the ... More
Presented by Dr. Igor ZHELEZNYKH on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.5 Board #: 075 (4B)
We consider the possible use of water and ice detectors designed for other purposes as detectors for slow magnetic monopoles. The mechanism we assume to dominate is monopole catalyzed baryon decay which can very efficiently turn protons into electromagnetic energy. Estimates of sensitivity for existing detectors are given.
Presented by Prof. John SWAIN on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2 Board #: 195 (10A)
The sun is variable in its magnetic activity with 11-year Schwabe cycle. This cyclic variation of solar activity modulates the energy spectrum of galactic cosmic rays entering the heliosphere and therefore the terrestrial radiocarbon production rate in the atmosphere changes with the same periodicity. Since the radiocarbon is taken into tree rings after the carbon cycle, the radiocarbon ... More
Presented by Prof. Kimiaki MASUDA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2 Board #: 187 (10A)
In this work we report an analysis of various indices of solar magnetic variability of closed and open field, concentrating particularly in the quasi-biennial peridicities (1.7-2.5 years). The wavelet technique is used in the time series of the solar indices to find the significant periodicities of our study, we also use other wavelet analysis already made. We consider the theory of a doub ... More
Presented by Mr. Luis DE CASO on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.5 Board #: 058 (3B)
GRAND is an array of position sensitive proportional wire chambers (PWCs) located at 86.2 deg W, 41.7 deg N at an elevation of 220 m and is adjacent to the campus of the University of Notre Dame. The geometry of the PWCs allows the angles of the charged secondary tracks to be measured to +/- 0.3 deg in each of two orthogonal planes. Muons are 99% differentiated from electron tracks in t ... More
Presented by Prof. John POIRIER on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.1 Board #: 203 (10B)
We present a new method to include a wavy heliospheric current sheet into a 2D numerical model of the heliospheric transport of galactic cosmic rays. Since the wavy current sheet has essentially 3D structure, we have developed an approach of averaging the corresponding drift effect over all longitudes for an axisymmetric model. First, an analytical solution is found for the flat sheet, this mo ... More
Presented by Dr. Ilya USOSKIN on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.6 Board #: 096 (5B)
Modified Henon–Heiles system describing geodesic in gravitational waves has already been investigated. There chaotic sense is inferred by the presence of fractal structure of the boundaries separating the basins of possible escapes. In this paper, observed chaotic behaviour is characterized by the formalism appropriating the signature of curvature tensor associated with the space-time ... More
Presented by Dr. Balendra Kr. DEV CHOUDHURY on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.2 Board #: 083 (4B)
Mass-induced oscillations between muon neutrinos and tau neutrinos have become the standard theory accounting for the zenith angle distributions of atmospheric neutrinos. However, there are other models which are able to produce similar effects and they are of both theoretical and experimental interest. In this talk, a neutrino oscillation analysis between muon neutrinos and tau neutrinos is ... More
Presented by Mr. Wei WANG
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.1 Board #: 084 (4B)
The emission of charged particles in 4.5 GeV/c proton-Emulsion interactions has been studied. The emulsion plates have been irradiated at Dubna Synchrophasatron.The experimental data were obtained at the Laboratory of High Energy Physics (LHEP)at Cairo University. Events have been chosen from the experimental data at certen conditions. In the present studies the average transverse momentu ... More
Presented by Dr. sayed SALEH
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.1
The energy region above the knee is studied through the e.m. and muon detectors at the GAMMA experiment (Mt. Aragats). We present analysis of the truncated number of muons shower size and other muon characteristics vs shower size and primary energy. The muon size spectrum for the muon energy threshold 5 GeV is also presented. The data are interpreted by means of simulations based on the ... More
Presented by Dr. A.P. GARYAKA
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.4
The semi diurnal anisotropy of cosmic ray Intensity for four different groups of days i.e. 60 Quiet days (60 QD),120 Quiet days (120 QD), continuous Quiet days (CQD) and all days (AD) have been analysed with planetary index Ap, Interplanetary magnetic field (B) and solar wind velocity (V) for the period 1985 to 1995. The annual average values of semidiurnal amplitude and phase are observ ... More
Presented by Dr. M.L. CHAUHAN
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2 Board #: 166 (8B)
The cosmic ray(CR) intensity data record with Goose bay Neutron Monitoring Station have been investigated on 60 quietest days (QD) in a year for studying the variation in tri-diurnal anisotropy during solar cycle 21 and 22. It has been observed that in spite of abrupt change in the amplitude and phase of tri- diurnal anisotropy in CR intensity, the amplitude is quite significance throu ... More
Presented by Mr. Mahendra RICHHARIA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 135 (7A)
The Tibet air shower array, consisting of 533 scintillation counters which are placed in a lattice with 7.5 m spacing, has been in operation since 1999 at Yangbajing in Tibet, China at an altitude of 4,300 m above sea level. We found a modest discrimination between gamma- and proton-initiated air showers based on air shower profiles observed by the Tibet air shower array. This method is app ... More
Presented by Dr. Masato TAKITA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.4
This paper examines the relationship between diurnal variations of cosmic ray intensity with average value of interplanetary magnetic field B, for the period 1989 to 2005. The effect on the annual average values of diurnal amplitude and phase with B have been investigated and it has been observed that the diurnal phase shifted to earlier hours in during the descending phase of the solar ... More
Presented by Dr. Ajay Kumar PANDEY
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 137 (7B)
Very High Energy Gamma Astronomy is one of the scientific aims of the ARGO-YBJ experiment (YangBaJing, P.R. China), an extensive air shower detector made of a single layer of Resistive Plate Chambers covering a surface of about 6700 m2. The exploitation of the full coverage approach (93% of active area) together with the very high altitude location (4300 m a.s.l.) allows to put the energy thre ... More
Presented by Mrs. Milena DATTOLI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.4 Board #: 160 (8B)
Abstract The first three harmonics of high amplitude anisotropic wave trains of cosmic ray intensity over the period 1991-1994 have been investigated for Deep River neutron monitoring station. It is observed that the diurnal time of maximum remains in the corotational direction, whereas the time of maximum for semi- diurnal anisotropy has no definite trend as compared to the quiet day annu ... More
Presented by Dr. RAJESH Kumar MISHRA
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.4 Board #: 159 (8B)
Abstract The present work deals with the study of first three harmonics of low amplitude anisotropic wave trains of cosmic ray intensity over the period 1991-1994 for Deep River neutron monitoring station. It is observed that the diurnal time of maximum remains in the corotational direction; whereas, the time of maximum for both diurnal and semi-diurnal anisotropy has significantly shifte ... More
Presented by Dr. RAJESH Kumar MISHRA
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.4 Board #: 179 (9B)
We study features of the 27-day variation of the galactic cosmic ray (GCR) three dimensional anisotropy calculated by the global spherical analyses method (GSM) using Fourier harmonic frequency filter, Chree’s diagram and epicyclegrams. We found that the greater amplitudes of the 27-day variation of the GCR anisotropy in the minima epoch of solar activity for the A>0 polarity period than for ... More
Presented by Ms. Renata MODZELEWSKA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.4 Board #: 191 (10A)
The long term modulation of the cosmic ray intensity includes both Sun and celestial anisotropies. The solar activity is due to high energy flares producing a decrease (known as Forbush Decrease, FD) in the cosmic ray intensity, with a time scale of the order of a few days, often accompained by a Ground Level Enhancement, due to direct Sun emission during the solar flare. The celest ... More
Presented by Mrs. Irina JAMES on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 112 (6A)
In February 2007 the MAGIC Air Cherenkov Telescope for gamma-ray astronomy was fully upgraded with a ultra fast 2GSamples/s digitization system. Since the gamma-ray signals are very short, a fast readout can minimize the influence of the background from the light of the night sky. Also, the time structure of the event is an additional parameter to reduce the background from unwanted hadronic s ... More
Presented by Dr. Abelardo MORALEJO on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.4 Board #: 015 (1B)
The study of time lags between spikes in Gamma-Ray Bursts light curves in different energy bands as a function of redshift may lead to the detection of effects due to Quantum Gravity. We present an analysis of 15 Gamma- Ray Bursts with measured redshift, detected by the HETE-2 mission between 2001 and 2006 in order to measure time lags related to astrophysical effects and search for Quantum G ... More
Presented by Dr. Julien BOLMONT on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2 Board #: 198 (10B)
The solar activity in Cycle 23 gradually changes to final minimum phase. Sun's shadow generated by multi-TeV cosmic-ray particles has been continuously observed with the Tibet-II and Tibet-III air shower array in 1996 through 2006 during almost whole period of the Solar Cycle 23. We have shown that the Sun’s shadow is strongly affected by the solar and interplanetary magnetic fields chang ... More
Presented by Dr. MASAKI NISHIZAWA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.4 Board #: 001 (1A)
"Delayed" EAS with N_e>5.10^6 particles are registered. It were detected 2117 showers with number of particles above 10^7, in 98 from these events "delayed" EAS with N_e>5.10^6 particles were detected. Impulse delay for the time from 40 up to 600 ns was registered. In 14 events delayed impulses were registered in 2 and more detectors and in 3 events - in 4 detectors. Average delay betwe ... More
Presented by Prof. Vladimir YAKOVLEV on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.5 Board #: 154 (8A)
The MAGIC telescope located on the Roque de los Muchachos on the Canary Island La Palma at a height of 2200m a.s.l. is able to point to the sea. This allows to search for air shower signatures induced by particles coming out of the Earth. Taking into account the huge effective area, this configuration can be used to search for tau-neutrinos. We will show the outcome of simulations for tau ... More
Presented by Dr. Markus GAUG, Dr. Ching-Cheng HSU on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 101 (5B)
An overview of TeVCat, a new online interactive catalog for very high energy (VHE; E > 50 GeV) gamma-ray astronomy is presented. As VHE astronomy continues to grow, the usefulness of a one-stop clearing house for information on new sources is increasingly evident. TeVCat is intended to be such a resource. With sky maps, source information, visibility plotters and linked references, it will hel ... More
Presented by Prof. Scott WAKELY on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.5 Board #: 189 (10A)
We have developed the technical data acquisition equipment (TEDA) for Green House Observing Satellite (GOSAT). GOSAT will be launched in middle of 2008 into sun synchronous sub-recurrent orbit with altitude of 666km and inclination of 98deg, and nominal mission duration is 5years. TEDA is a comprehensive orbital radiation environment monitor system designed to provide measurement of th ... More
Presented by Mr. yasutomo SASAKI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.2 Board #: 017 (1B)
Several phenomenological models of physics beyond the Standard Model predict flavor mixing in the neutrino sector in addition to conventional mass-induced oscillations. In particular, violation of Lorentz invariance, violation of the equivalence principle, and quantum decoherence can each result in observable distortions in the high-energy atmospheric neutrino spectrum. We report on a sear ... More
Presented by Mr. John KELLEY on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2 Board #: 201 (10B)
The solar periodicities of 80-88 yrs (Gleissberg cycle) and 205 yrs (de Vries cycle or Suess cycle) using different time series of proxies of cosmogenic isotopes have been reported in a great number of papers. In this work we present a more objective and general cycle-length determination applying the wavelet transformation based on the Morlet wavelet to the cosmogenic isotopes. We use the IN ... More
Presented by Dr. Victor Manuel VELASCO HERRERA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.5 Board #: 086 (5A)
The ANTARES collaboration is building an underwater neutrino telescope at 2500 m depth in the Mediterranean Sea. The experiment aims to detect high- energy cosmic neutrinos using a 3D array of 900 photomultipliers distributed along 12 lines. 5 such lines have been operational since January 2007. The PMTs collect the Cherenkov light induced by neutrino-produced charged particles in the wat ... More
Presented by Dr. Marco CIRCELLA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 103 (5B)
The ANTARES neutrino telescope is being constructed in the Mediterranean Sea. The complete detector will consist of 12 strings, supplemented by an additional instrumentation line. Five strings are at present deployed and operating. Each string is equipped with 75 Optical Modules (OMs) housing the photomultipliers to detect the Cherenkov light induced by the charged particles produced in ... More
Presented by Mr. Felix FEHR on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 104 (5B)
One of the main design goals of the MAGIC telescopes is the very fast repositioning in case of e.g. GRB alarms, implying a low weight of the reflector dish. This is accomplished by using a space frame made of carbon fiber epoxy tubes, resulting in a strong but not very rigid support structure. Therefore it is necessary to readjust the individual mirror tiles to correct for deformations of the ... More
Presented by A. BILAND on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.5 Board #: 066 (4A)
The Alpha Magnetic Spectrometer (AMS) is a particle physics detector designed to measure charged cosmic rays spectra up to TV region, with high energy photon detection capability up to few hundred GeV. With the large acceptance, the long duration (3 years) and the state of the art particle identification techniques, AMS will provide the most sensitive search for the existence of anti mat ... More
Presented by Prof. Bruna BERTUCCI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.5 Board #: 144 (7B)
We present results on searches for exotic particles (relativistic magnetic monopoles and WIMPs), for neutrinos from an SGR Burst and for UHE muons, obtained with the Baikal telescope NT200 from 1998-2005.
Presented by et al. WISCHNEWSKI, R. on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 132 (7A)
The MAGIC telescope has been designed for the observation of the Cherenkov light generated in Extensive Air Showers. However, its 17 m. diameter and optical design makes it suitable for optical observations as well. In this contribution, we describe the final set-up and performance of a system installed at the center of the MAGIC camera (the central pixel) and based on the use of a dedicate ... More
Presented by Prof. María Victoria FONSECA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.1 Board #: 193 (10A)
The propagation of energetic particles in the heliosphere is described by the Parker transport equation. It includes the physical processes of diffusion, drift, convection and adiabatic energy changes. For the modulation of the particle's energy spectra the geometry of the heliospheric magnetic field is important, but it is still an unsolved problem. In this contribution we present model c ... More
Presented by Prof. Adri BURGER on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.5 Board #: 032 (2B)
The detection of astrophysical sources of high energy neutrinos is one of the most interesting quests in modern astrophysics. Unlike gamma and X-ray observations, the low number of signal events expected in high energy neutrino telescopes, constrains significantly the discovery probability of the sources. New algorithms to disentangle clusters of small number events from the background events ... More
Presented by Mr. Juan Antonio AGUILAR SÁNCHEZ on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.4 Board #: 010 (1A)
The energies of the lepton (muon and electron) which is produced by neutrino interaction and the direction pf the incident neutrino are two fundamental parameters for high energy neutrino astrophysics. In the experiment for high energy neutrino astrophysics, all the most of muons from muon neutrino events which occur inside an effective volume of the apparatus escape from it without loos ... More
Presented by Prof. Nobusuke TAKAHASHI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7
The H.E.S.S. Atmospheric Cherenkov Array commenced operations in 2003 and has proved very successful, yielding numerous detections of astrophysical gamma-ray sources. The development of H.E.S.S. is now entering a new phase, with the H.E.S.S. II project currently at the construction stage. This upgrade includes the construction of a very large telescope in the centre of the current H.E.S.S. arr ... More
Presented by Dr. Conor MASTERSON
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.4
Okamoto-Shibata developed a new simulation technique which is applied to the calculation of the cascade shower, keeping the rigidity of the technique and saving much time for computation( Okamoto and Shibata, NIM,A257(1987)155). We apply their technique to the LPM shower in water for the detection of the electron neutrino in extremely high energies. The results obtained under Okamoto-Shibat ... More
Presented by Dr. Masanobu TAMADA
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.2 Board #: 011 (1B)
Quasi Elastic Scattering in the dominant mechanism for producing both Fully Contained Events and Partially Contained Events for the examination of the neutrino oscillation in the Super-Kasmiokande(SK) detector for the atmospheric neutrinos in the energy range from several hundreds MeV to several GeV. In the analysis of these neutrino events, SK collaboration assume that the direction of t ... More
Presented by Prof. Eiichi KONISHI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.3 Board #: 061 (3B)
The proposed northern-hemisphere cubic-kilometre under water neutrino detector, KM3NeT, promises unprecedented sensitivity to potential fluxes of neutrinos from southern hemisphere gamma-ray counterparts. KM3NeT is briefly outlined before gamma-ray observations of AGN are used to set upper-limits on the neutrino production rate in these potential extragalactic cosmic ray engines. Absorption of ... More
Presented by Dr. Richard WHITE on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.4 Board #: 182 (9B)
The periodicities of cosmic ray space intensity variation are analyzed using Lomb-Scargle Fourier transformation method with about 37 billion cosmic ray events recorded by Tibet III Air Shower Array during the period from November 1999 to November 2005. To eliminate meteorological effect, we adopt East- West subtraction method. According to our analysis, except the well known solar diurn ... More
Presented by Dr. aifeng LI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.1 Board #: 008 (1A)
The high-energy physics community has been discussing for years the need to bring together the three principal disciplines that study hadron cross-section physics - ground-based accelerators, cosmic-ray experiments in space, and air shower research. Only recently have NASA investigators begun discussing the use of space-borne cosmic-ray payloads to bridge the gap between accelerator phys ... More
Presented by Dr. Thomas WILSON on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 142 (7B)
The VERITAS array trigger requires a simultaneous coincidence between multiple telescopes to initiate the readout of data and is essential to reducing the overwhelming background of local muons whilst efficiently recording light from VHE gamma ray initiated air showers. The selection of coincident events in hardware reduces the overall trigger rate allowing the individual telescopes to trigger ... More
Presented by Dr. Richard WHITE on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 098 (5B)
VERITAS is an array of Imaging Atmospheric Cherenkov Telescopes designed for very high energy gamma ray (E>100GeV) observations of astrophysical sources. The experiment began its scientific observation program in the 2006/2007 observing season. We describe here the analysis chain for reducing the data, reconstructing the direction and energy of incident gamma-rays and the rejection of backgro ... More
Presented by Dr. Michael DANIEL on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 146 (7B)
The VERITAS gamma-ray observatory, situated in southern Arizona, is an array of four 12-m diameter imaging Cherenkov telescopes, each with a 499-pixel photomultiplier-tube camera. The instrument is designed to detect astrophysical gamma rays in excess of 100GeV. At the low end of the VERITAS energy range, fluctuations in the night sky background light and single muons from cosmic-ray shower ... More
Presented by Dr. Amanda WEINSTEIN on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.2 Board #: 013 (1B)
Compared with the analysis of Fully Contained Events and Partially Contained Events occurring inside the detector in Superkamiokande for the investigation of the neutrino oscillation, the analysis of the Upward Stopping Muon Events and Upward Through Going Muon Events occurring the outside detector is much easier, although the quality of the experimental data is inferior to the former. We ... More
Presented by Prof. Nobusuke TAKAHASHI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 139 (7B)
The 17m diamter MAGIC telescope is currently the largest single dish Cherenkov telescope for gamma ray astronomy. Within the year 2007 it will be upgraded with a second telescope MAGIC-II. The camera of MAGIC-II will include several new features compared to the MAGIC-I camera. Photomultipliers with the highest available photon collection efficiency have been selected. A modular design allows e ... More
Presented by Mr. Ching-Cheng HSU on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.5
* Presenter's name and Affiliation: P.M. Kooijman, Nationaal Instituut voor Kernfysica en Hoge-Energiefysica (NIKHEF), P.O. Box 41882, 1009 DB Amsterdam, The Netherlands * Title of the paper: The development of multi-PMT optical modules with photonic readout for KM3NeT * Preferred presentation type (oral or poster): oral * Suggested session codes (up to 2): OG.2.7, HE.2.5 ... More
Presented by Prof. Paul KOOIJMAN
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.1 Board #: 190 (10A)
The effects on the galactic cosmic ray modulation of a Parker field modified by a atitudinal-dependent solar wind speed are numerically investigated. The calculation of the propagation of the galactic cosmic ray is made by solving a coupled set of the stochastic differential equations which is equivalent to the so-called diffusion convection partial differential equation. The stochastic ... More
Presented by Ms. Shoko MIYAKE on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.1 Board #: 022 (2A)
Gamma-hadron superfamily STRANA with E0 > 10^16 eV and unusual features was detected by emulsion chamber at the board of stratospheric balloon. In the center of the family there was found a halo. The halo and the high energy jet producing it in the chamber are analysed here.
Presented by Dr. Vladislav OSEDLO on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7
30th International Cosmic Ray Conference The hard X ray detector and its electronics borne by SZ2 spacecraft H.Y. Wang, Y.Q. Ma, C.M. Zhang, Y.P. Xu, P.R. Shen, J.Z. Wang, X.H. Liang, M. Gao M. Zhao, Y. Li Key Laboratory of Particle Astrophysics, IHEP, Beijing 100049, PR China Abstract SZ2/XD is a hard x-ray detector system, which was built for monitoring of the transient radiations, su ... More
Presented by Dr. Huanyu WANG
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.4 Board #: 047 (3A)
The muon charge ratio of the lateral muon density distributions in single Extended Air Showers (EAS) is considered on basis of Monte Carlo simulations, in view of proposals to measure this observable in coincidence with EAS observations. Differences of the azimuthal variation of the muon densities of opposite charges and the azimuthal variation of the muon charge ratio appear to be ve ... More
Presented by Prof. Octavian SIMA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 148 (8A)
The MAGIC Collaboration is building a clone, MAGIC II, of the current MAGIC Telescope. MAGIC II will be built at 85 m of distance from MAGIC I, and will also feature a huge reflecting surface of ~240 m^2 of area. Unlike the former telescope, the mirrors for the new one are lighter and larger, being square of 1 m of side and weighting 10÷12 kg. For the development and production of th ... More
Presented by Dr. Denis BASTIERI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.2 Board #: 172 (9A)
We estimate to what extent the neutron monitor and stratospheric GCR data can be used for getting information on the intensity of the GCRs in a so called medium energy range (100-500 MeV/n), very important for studying the heliosphere and the GCR modulation there. The hourly data of the neutron monitors Apatity (since 1969) and Moscow (since 1958) are used as well as the standard set of the qu ... More
Presented by Dr. Mikhail KRAINEV on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.4 Board #: 016 (1B)
We evaluate the muon and tau energy loss produced by photonuclear interactions at high energies by using different theoretical models. The theoretical uncertainty is estimated by taking different extrapolations of the DIS structure functions in the low and moderate $Q^2$ range at extremely low values of $x$ where nuclear shadowing could be stronger than usually thought. Photonuclear inte ... More
Presented by Gonzalo PARENTE on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.5 Board #: 087 (5A)
This paper describes the timing calibration system for the NEMO (NEutrino Mediterranean Observatory) underwater neutrino telescope. Timing calibration is a critical task to perform in such a large apparatus, as the track reconstruction capabilities strongly depend on the accuracy of the time alignment of the measurements made by the different sensors. A system based on an optical fibre n ... More
Presented by Dr. Marco CIRCELLA on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7
R&D activities for the Lake Baikal Gigaton Volume (km3) detector have started. The currently operating Baikal Neutrino Telescope NT200+ gives an excellent oppportunity for physics and technology tests, since new equipment can easily be installed during yearly routine telescope maintenance periods. We describe in-situ longterm tests of new Hamamatsu and Photonis PMTs (10", 12" and 13") and o ... More
Presented by et al. WISCHNEWSKI, R.
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.4 Board #: 167 (8B)
The two-dimensional solar diurnal variation of the galactic cosmic-ray intensity is measured in TeV energy range using data taken from Tibet III air shower array (Nov.1999-Nov.2005). The variation are consistent with the Compton- Getting anisotropy due to the terrestrial orbital motion around the sun in the high energy (12TeV) data sample;while an additional variation is observed in the l ... More
Presented by Dr. Yi ZHANG on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.2.5 Board #: 031 (2A)
The report describes a 4-channel digital device which can be regarded as a prototype elementary unit for future underwater acoustic neutrino telescopes. Signals from the hydrophones, arranged in a pyramid-like geometry with 144 cm spacing between the hydrophones, are amplified and processed by a 16-bit ADC card with a frequency up to 200 kHz. There are three regimes of operation of the i ... More
Presented by Dr. Ralf WISCHNEWSKI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 133 (7A)
In February 2007 the MAGIC Air Cherenkov Telescope for gamma ray astronomy was fully upgraded with a ultra fast 2GSamples/s digitization system. Since the gamma ray signals are very short, a fast readout can minimize the influence of the background from the light of the night sky. Fast flash analog to digital converters (FADCs) are commercially available, but they are prohibitively expensiv ... More
Presented by Dr. Florian GOEBEL on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: HE.3.3 Board #: 023 (2A)
The issue of the Dark Matter distribution inside the halos is a very complicated one. N-body simulations data, which are usually assumed to represent the dark matter shape inside the halos, suffer from the bug of flattening the model to all types of Galaxy, without taking into account the peculiar properties of each Galaxy. In this work we extract informations on the Dark Matter distribution ... More
Presented by Dr. Lidia PIERI on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.3.4
The cosmic ray intensity data from Rome neutron monitoring station has been harmonically analyzed for the period 1976-2004 covering three solar cycles 21, 22 and 23. This analysis is performed for four different groups of days 60QD, 120QD, CQD and AD with statistical errors. During the entire period of investigation, the amplitude of higher harmonics is low at / near the minima of each s ... More
Presented by Mrs. Alka JAIN
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 111 (6A)
VERITAS, the Very Energetic Radiation Imaging Telescope Array System, is an array of four 12 m diameter imaging atmospheric Cherenkov telescopes for gamma-ray astronomy above 100 GeV currently in operation in Arizona. The VERITAS Collaboration has developed VEGAS, the VERITAS Gamma-ray Analysis Suite, a data-analysis software package for the processing of single- and multiple-telescope data ... More
Presented by Dr. Peter COGAN on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 147 (7B)
VERITAS employs a multi-stage data acquisition chain that extends from the VME readout of custom 500 MHz flash ADC electronics to the construction of telescope events and ultimately the compilation of information from each telescope into array level data. These systems provide access to the programming of the channel level triggers and the FADCs. They also ensure the proper synchronization of ... More
Presented by Elizabeth HAYS on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.5 Board #: 127 (7A)
With a volume of ~1 km3, IceCube will be able to detect very high energy neutrinos above ~1E17 eV. At these energies, bremsstrahlung and pair production are suppressed by the Landau-Pomeranchuk-Migdal effect (LPM). Therefore, nu_e and nu_tau interactions in the ice can produce several hundred meter long showers. We present an analysis of IceCube sensitivity to such events. It includes simulat ... More
Presented by Dr. Julien BOLMONT on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: OG.2.7 Board #: 125 (6B)
We present a design for novel two-mirror aplanatic telescopes for use in ground-based gamma-ray astronomy. Comparing to a traditional Davies-Cotton reflector, an aplanatic telescope can achieve significant reduction of plate scale. The telescope design can be configured to balance the need for wide-field of view, high angular resolution, large light collecting area, and high degree of un ... More
Presented by Stephen FEGAN on 9/7/2007 at 19:45
Type: Poster Session: Posters 3 + Coffee
Track: SH.5.1 Board #: 176 (9A)
The joint analysis of experimental data on cosmic ray fluxes measured in the stratosphere at 1 a.u. and measured by Voyager - 1 spacecraft at the different distances from the Earth is made. The relationship between cosmic ray fluxes in the stratosphere and interplanetary magnetic field strength are used to get cosmic ray flux outside the modulation region. The evaluation of the modulation reg ... More
Presented by Prof. Yuri STOZHKOV on 9/7/2007 at 19:45