3-11 July 2007
Merida, Mexico
Mexico/General timezone
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HE 1.1.A

Place

Location: Merida, Mexico
Room: Yucatan II+III+IV (Fiesta Americana)
Date: from 6 Jul 11:45 to 9 Jul 11:06

Timetable | Contribution List

Displaying 11 contributions out of 11
Type: Oral Session: HE 1.1.A
Track: HE.1.1.A
Characteristics of air-showers and accompanied high energy atmospheric families detected in the hybrid experiment at Mt. Chacaltaya are studied in detail and compared with those of simulations taking into accounts the specific detection bias of the experiment. It is shown that the observed characteristics of the atmospheric families accompanied by large air showers, Ne > 10^7, and also those ... More
Presented by Dr. Masanobu TAMADA on 9/7/2007 at 13:42
Type: Oral Session: HE 1.1.A
Track: HE.1.5
Cosmic rays with energies between 10^16.5 and 10^18.5 eV exhibit a rich range of features. The energy spectrum changes index at at least two points, known as the "second knee" and the "ankle". There appears to be a composition change in this energy regime as well, which may indicate a shift in predominance from galactic to extragalactic sources. The Telescope Array Low-Energy Extension - ... More
Presented by Prof. John BELZ on 9/7/2007 at 14:42
Type: Oral Session: HE 1.1.A
Track: HE.1.1.B
The values of the spectral indices of the cosmic ions below the knee energy band are of notable importance for a quantitative account of the characteristic of the knee and the ankle of the differential energy spectrum of the cosmic radiation. Present available measurements of proton and helium spectral indices below the knee energy interval from a variety of experiments are examined. Acc ... More
Presented by Dr. Antonio CODINO on 6/7/2007 at 16:45
Type: Oral Session: HE 1.1.A
Track: HE.1.1.A
Gamma-families were sampled for Pamir altitude (600g/cm2) by MC0 model with PCR spectra and composition proposed by KASCADE. Comparison of the calculated and Pamir experimental data on the gamma-families characteristics ( energy spectra of particles, summary energy spectra of particles and intensity of families) shows contradiction between them
Presented by Dr. V.G. DENISOVA on 9/7/2007 at 15:30
Type: Oral Session: HE 1.1.A
Track: HE.1.1.A
With the present size of the IceTop air shower array it is possible to measure an energy spectrum in the range of 1 PeV to 100 PeV. To do so, a lateral pulse height fit was performed on all analysed showers. Therefore it is crucial to have a realistic parametrisation of the expected lateral distribution and the corresponding fluctuations of the measured tank signals. Since IceTop tanks do not ... More
Presented by Mr. Stefan KLEPSER on 9/7/2007 at 15:54
Type: Oral Session: HE 1.1.A
Track: HE.1.1.A
We have measured the primary cosmic ray spectra of various nuclear groups by analyzing the relationship between muon multiplicity distribution and air shower size, and we have also estimated their mean mass as a function of primary energy. The shower data were obtained from the four years of observations with the GRAPES-3 air shower experiment, which has a high-density air shower array o ... More
Presented by Dr. Hideki TANAKA on 9/7/2007 at 14:06
Type: Oral Session: HE 1.1.A
Track: HE.1.1.A
We confirm the result obtained many years ago at Tien-Shan mountain station with the large 36-m^2 lead calorimeter, that in extensive air showers (EAS) with energies of few PeV the attenuation of core energy deposit in lead becomes slower than it is predicted by modern codes. To study the absorption of EAS hadrons and muons in a lead ionization calorimeter, the EAS development in ... More
Presented by Prof. Liubov SVESHNIKOVA
Type: Oral Session: HE 1.1.A
Track: HE.1.1.A
The chemical composition of primary cosmic rays in the energy range ~10^15 eV are going to be examined from muon energy spectra using the AIRES simulation program. The muon energy spectra observed by the compact extensive air shower array and the solid iron magnet spectrometer are compared with simulation result.
Presented by Mr. Hiroki MATSUMOTO on 9/7/2007 at 15:42
Type: Oral Session: HE 1.1.A
Track: HE.1.1.A
The study of the evolution of the cosmic ray anisotropy over primary energy in the range 10^14-10^15 eV can provide a significant tool for the understanding of the knee in the primary spectrum. The EAS-TOP result obtained at Eo ~ 10^14 eV has been extended to higher energies in order to approach the knee region, by exploiting the full data set (about 10 years of data taking). Results derived ... More
Presented by Prof. - THE EAS-TOP COLLABORATION on 9/7/2007 at 13:30
Type: Oral Session: HE 1.1.A
Track: HE.1.1.B
Earlier we proposed that the steepening of the energy spectrum of primary cosmic rays beyond the knee could be due to the mass distribution of progenitors of cosmic ray source. Here we have shown that the proposal works well if cosmic rays of energies below the ankle of the spectrum are accelerated in a single type of source by ultra relativistic shock waves.
Presented by Dr. Arunava BHADRA
Type: Oral Session: HE 1.1.A
Track: HE.1.1.A
The proton-air inelastic cross section at sqrt(s) approximately 2 TeV has been obtained from the EAS-TOP Extensive Air Shower experiment data. The absorption length of cosmic ray proton primaries cascades is studied in the energy range just below the knee of the primary spectrum. Primary energies are selected through the EAS muon contents while proton originated cascades at maximum develop ... More
Presented by Dr. Gian Carlo TRINCHERO on 9/7/2007 at 14:18
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