BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:A MC simulation of neutrino showers and their detection with the P ierre Auger Observatory DTSTART;VALUE=DATE-TIME:20070710T171700Z DTEND;VALUE=DATE-TIME:20070710T172900Z DTSTAMP;VALUE=DATE-TIME:20261016T110620Z UID:indico-contribution-66-0-160@cern.ch DESCRIPTION:Speakers: Dr. GORA\, Dariusz (INP - Poland\, Universitat Karls ruhe (TH))\nHigh energetic neutrinos coming from space can interact either in the atmosphere \nor in the Earth. In the first scenario neutrino ma y initiate extensive air showers\n(EAS) in the atmosphere\, but due to the ir very small interaction cross section in air\nonly very inclined EAS might be detectable by large detectors. In the second scenario \n neutr ino may interact inside the Earth and produce a charge lepton which aft er\nseveral interactions emerges from the Earth and decays above the grou nd. Among the\nthree neutrino species\, the showers initiated by tau n eutrinos are the most \npromising\nto be detected. In this paper we prese nt a study about the possibility to detect\nneutrino induced extensive air showers at the Pierre Auger Observatory. The Monte\nCarlo simulations per formed take into account the details of the neutrino\npropagation inside the Earth\, the air\n as well as the surrounding mountains which are mode lled by a digital elevation map.\nDetails on the sensitivity with respect to the incoming direction as well \n as the aperture\, the total observab le event rates on the basis of various assumptions \n of the incoming neut rino flux and an upper limit for ultra high energy neutrinos\,\nabove 0.1 EeV\, are calculated.\n\nhttps://indico.nucleares.unam.mx/event/4/session/ 66/contribution/160 LOCATION:Merida\, Mexico Kabah (Holiday Inn) URL:https://indico.nucleares.unam.mx/event/4/session/66/contribution/160 END:VEVENT BEGIN:VEVENT SUMMARY:Investigation of backgrounds for horizontal neutrino showers at ul tra-high energy DTSTART;VALUE=DATE-TIME:20070710T172900Z DTEND;VALUE=DATE-TIME:20070710T174100Z DTSTAMP;VALUE=DATE-TIME:20261016T110620Z UID:indico-contribution-66-0-183@cern.ch DESCRIPTION:Speakers: Prof. KAMPERT\, Karl-Heinz (University of Wuppertal\ , Germany)\nA possible signature of a neutrino-induced air shower is a nea r-horizontal event \ndeveloping very deeply in the atmosphere at depths ex ceeding a few thousand g/cm^2. \nMaking use of high-statistics shower libr aries we study the background to such events from: \n(1) high-energy muons produced in primary proton events\, which may propagate deeply \ninto the atmosphere before initiating a subcascade\; (2) primary photons\, which m ay start \nto cascade late due to a suppression of the Bethe-Heitler cross -section by the LPM effect. \nThe rates of background events are compared with various flux models of ultra-high energy \nneutrino production.\n\nht tps://indico.nucleares.unam.mx/event/4/session/66/contribution/183 LOCATION:Merida\, Mexico Kabah (Holiday Inn) URL:https://indico.nucleares.unam.mx/event/4/session/66/contribution/183 END:VEVENT BEGIN:VEVENT SUMMARY:Reducing uncertainty in atmospheric neutrino flux prediction. DTSTART;VALUE=DATE-TIME:20070710T174100Z DTEND;VALUE=DATE-TIME:20070710T175300Z DTSTAMP;VALUE=DATE-TIME:20261016T110620Z UID:indico-contribution-66-0-274@cern.ch DESCRIPTION:Speakers: Dr. HONDA\, Morihiro (Institute for Cosmic Ray Resea rch\, Univ. of Tokyo)\nThe atmospheric neutrino is still an important tool in the study \nof neutrino physics. The uncertainty of the predicted atmo spheric \nneutrino flux is caused by the uncertainties in the physical \na ssumptions and in the calculation scheme. \nWe discuss them quantitatively \, and present the works to reduce them. \nThe uncertainty related to the hadronic interaction model was \ndiscussed before\, therefore\, we mainly study other uncertainty sources \nthan the hadronic interaction model here .\n\nhttps://indico.nucleares.unam.mx/event/4/session/66/contribution/274 LOCATION:Merida\, Mexico Kabah (Holiday Inn) URL:https://indico.nucleares.unam.mx/event/4/session/66/contribution/274 END:VEVENT BEGIN:VEVENT SUMMARY:Uncertainty Estimates for Atmosheric Neutrino Fluxes DTSTART;VALUE=DATE-TIME:20070710T175300Z DTEND;VALUE=DATE-TIME:20070710T180500Z DTSTAMP;VALUE=DATE-TIME:20261016T110620Z UID:indico-contribution-66-0-329@cern.ch DESCRIPTION:Speakers: Dr. BARR\, Giles (Oxford University)\nStarting from a survey of experimental measurements\, we assign uncertainties to the\ntw o most critical inputs to the calculation of fluxes of unoscillated atmosp heric\nneutrinos\, the hadron production and the primary cosmic ray fluxes . We then\npropagate these uncertainties through the entire flux calculat ion to arrive at\nestimates of the uncertainties in the fluxes of neutrino s and of various ratios of\nneutrino fluxes. We find that there is indeed a significant cancellation of flux\nuncertainties when these ratios are m ade. The uncertainties as a function of\nneutrino energy will be presente d.\n\nhttps://indico.nucleares.unam.mx/event/4/session/66/contribution/329 LOCATION:Merida\, Mexico Kabah (Holiday Inn) URL:https://indico.nucleares.unam.mx/event/4/session/66/contribution/329 END:VEVENT BEGIN:VEVENT SUMMARY:UHE Neutrino Flux Limits: From Parkes Onwards DTSTART;VALUE=DATE-TIME:20070710T180500Z DTEND;VALUE=DATE-TIME:20070710T181700Z DTSTAMP;VALUE=DATE-TIME:20261016T110620Z UID:indico-contribution-66-0-431@cern.ch DESCRIPTION:Speakers: Mr. JAMES\, Clancy (University of Adelaide)\nThe Lun ar Cherenkov technique\, which aims to detect the coherent Cherenkov \nra diation\nproduced when UHE particles interact in the lunar regolith\, was first attempted \nwith\nthe Parkes radio-telescope in 1995\, though the th eory was not sufficiently \ndeveloped\nat this time to calculate a limit o n the UHE neutrino flux from the non-\nobservation.\nSince then\, the tech nique has evolved to include experiments utilising lower\nfrequencies\, wi der bandwidths\, and entire arrays of antenna. Simulations of \nthe\ntech nique have likewise evolved\, providing new insight into the dependence of \nexperimental sensitivity on the set-up. We develop a simulation to anal yse the \nfull\nrange of experiments\, and calculate the UHE neutrino flux limit from\nthe Parkes experiment\, including the directional dependence. Our results \nsuggest a\nmethodology for planning future observations\, a nd demonstrate how to utilise \nall\navailable information on the nature o f radio pulses from the Moon for the \ndetection\nof UHE particles.\n\nhtt ps://indico.nucleares.unam.mx/event/4/session/66/contribution/431 LOCATION:Merida\, Mexico Kabah (Holiday Inn) URL:https://indico.nucleares.unam.mx/event/4/session/66/contribution/431 END:VEVENT BEGIN:VEVENT SUMMARY:Cherenkov radio emission from showers in dense media at EeV energi es DTSTART;VALUE=DATE-TIME:20070710T181700Z DTEND;VALUE=DATE-TIME:20070710T182900Z DTSTAMP;VALUE=DATE-TIME:20261016T110620Z UID:indico-contribution-66-0-459@cern.ch DESCRIPTION:Speakers: Dr. ALVAREZ-MUNIZ\, Jaime (IGFAE and Dept. Fisica de Particulas\, Univ. de Santiago de Compostela\, Spain)\nThe properties of extremely energetic neutrino- and cosmic ray-induced\nshowers depend on th e shower energy\, on the type of particle initiating the shower\,\nand on the medium. Studying these dependences is important both for understanding \ncascade phenomenology\, and for estimating the efficiency of experiment s using the radio \ntechnique. In this contribution we study the feasibili ty of applying 'thinning\ntechniques'\nto the simulation of extremely ener getic electromagnetic showers.\nWe show that thinning is a powerful tool t hat allows a considerable reduction in\ncomputing time while keeping a goo d level of accuracy in the relevant shower \nand radio observables produce d in the simulations. We apply thinning techniques\nto the simulation of E eV electromagnetic showers in a variety of materials\,\nincluding the Land au-Pomeranchuk-Migdal effect that is relevant for shower\ndevelopment at v ery high energies. This study is essential in determining\nthe sensitivity to extremely energetic neutrinos and cosmic rays of\nexperiments looking for radiopulses in ice such as RICE and ANITA\, \nand in the moon regolith such as LUNASKA\, the Westerbork radiotelescope \narray and LOFAR.\n\nhtt ps://indico.nucleares.unam.mx/event/4/session/66/contribution/459 LOCATION:Merida\, Mexico Kabah (Holiday Inn) URL:https://indico.nucleares.unam.mx/event/4/session/66/contribution/459 END:VEVENT END:VCALENDAR