BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Study of small scale fluctuations in charged particle and muon den sities at the ground level with no-thinning simulations of extensive air s howers DTSTART;VALUE=DATE-TIME:20070705T153000Z DTEND;VALUE=DATE-TIME:20070705T154200Z DTSTAMP;VALUE=DATE-TIME:20260607T170201Z UID:indico-contribution-53-0-1069@cern.ch DESCRIPTION:Speakers: Mr. RUBTSOV\, Grigory (Institute for Nuclear Researc h of the Russian Academy of Sciences)\nThe particle density in extensive a ir showers fluctuates at the ground level. These\nfluctuations\, at the sc ale of the scintillator detector size (several meters)\, lead\nto the dive rsity of the individual detector responses. Therefore\, small scale\nfluct uations contribute to the error in the estimation of the primary energy by a\nground array. As a results of analysis of simulated full (unthinned) s howers\, this\ncontribution is shown to be non-Gaussian. The impact on the primary energy spectrum\nmeasured by a ground array is estimated. It is a rgued that super-GZK events observed\nby AGASA experiment do not result fr om the energy overestimation\, due to small scale\nfluctuations\, of lower energy events. We confirmed that the muon density at the\nindividual muon detectors obeys the Poisson law. The impact of the fluctuations on\nthe r econstructed muon density at 1000 meters is estimated.\n\nhttps://indico.n ucleares.unam.mx/event/4/session/53/contribution/1069 LOCATION:Merida\, Mexico Kabah (Holiday Inn) URL:https://indico.nucleares.unam.mx/event/4/session/53/contribution/1069 END:VEVENT BEGIN:VEVENT SUMMARY:Hadronic Interaction Model EPOS and Air Shower Simulations: New Re sults on Muon Production. DTSTART;VALUE=DATE-TIME:20070705T154200Z DTEND;VALUE=DATE-TIME:20070705T155400Z DTSTAMP;VALUE=DATE-TIME:20260607T170201Z UID:indico-contribution-53-0-905@cern.ch DESCRIPTION:Speakers: Dr. PIEROG\, Tanguy (FZK\, IK)\nSince about one deca de\, air shower simulations based on the hadronic interaction\nmodels QGSJ ET and SIBYLL predict very similar results for the main observables. For\ ninstance\, the mean depth of the shower maximum Xmax agrees within 5% b etween the\ndifferent models and are in relative good agreement with the measurements. However\nthe number of muons at ground differs substantiall y between these 2 models and the\ndata. Recently a new hadronic interactio n model EPOS has been introduced in air\nshower simulation programs. This model has originally been used to analyse\nhadron-hadron as well as heavy ion physics at RHIC and SPS energies\, and it gives\nvery interesting res ults in air shower simulations: we find for example a large\nincrease in t he number of muons at ground as compared to the former models. Results\nwi ll be discussed in detail\, in particular the role of the baryons and anti -baryons\nin the air shower development.\n\nhttps://indico.nucleares.unam. mx/event/4/session/53/contribution/905 LOCATION:Merida\, Mexico Kabah (Holiday Inn) URL:https://indico.nucleares.unam.mx/event/4/session/53/contribution/905 END:VEVENT BEGIN:VEVENT SUMMARY:Testing the low energy hadronic models used in Aires\, with CAPRIC E98 results. DTSTART;VALUE=DATE-TIME:20070705T155400Z DTEND;VALUE=DATE-TIME:20070705T160600Z DTSTAMP;VALUE=DATE-TIME:20260607T170201Z UID:indico-contribution-53-0-345@cern.ch DESCRIPTION:Speakers: Dr. HANSEN\, Patricia Maria (Departamento de Fisica de Particulas -Universidade de Santiago de Compostela-15782 Santiago de Co mpostela\,Spain)\nAir shower simulation programs are used to reconstruct t he energy in the UHECR\nsurface detectors. This reconstruction is based on the lateral distribution function\nobtained in the experiment. It is also known that this function at core distance\ngreater than 1 km strongly dep ends on the low energy hadronic models used in the\nsimulation. There are discrepancies in the particle production\ndue to the different models that are used. This discrepancy is not only at high \n(>100 GeV) but also at low energy. Almost all collider experiments show difficulties\nin the mea surement of the diffractive cross section since they do not register\npart icles emitted into the forward direction.\nA new version of the air shower simulation programs AIRES\, with an improved treatment\nof the diffractiv e cross section in the low energy hadronic model was developed.\nTo cross- check this model\, we compare the results of the balloon born experiment\n CAPRICE98\, on atmospheric fluxes of particles with this new version of A IRES.\n\nhttps://indico.nucleares.unam.mx/event/4/session/53/contribution/ 345 LOCATION:Merida\, Mexico Kabah (Holiday Inn) URL:https://indico.nucleares.unam.mx/event/4/session/53/contribution/345 END:VEVENT BEGIN:VEVENT SUMMARY:Applying EAS universality to ground detector data DTSTART;VALUE=DATE-TIME:20070705T160600Z DTEND;VALUE=DATE-TIME:20070705T161800Z DTSTAMP;VALUE=DATE-TIME:20260607T170201Z UID:indico-contribution-53-0-752@cern.ch DESCRIPTION:Speakers: Mr. SCHMIDT\, Fabian (University of Chicago)\nAir sh ower universality states that the electromagnetic part of hadron-induced\n EAS can be completely described in terms of the primary energy and shower age. \nIn addition\, simulations show that the muon part is well character ized by \nan overall normalization which depends on the primary particle a nd hadronic \ninteraction model. We investigate the consequences of EAS un iversality\nfor ground arrays\, which sample EAS at large core distances\, and show\nhow universality can be used to experimentally determine the mu on \ncontent as well as the primary energy of cosmic ray air showers in a \nmodel-independent way.\n\nhttps://indico.nucleares.unam.mx/event/4/sessi on/53/contribution/752 LOCATION:Merida\, Mexico Kabah (Holiday Inn) URL:https://indico.nucleares.unam.mx/event/4/session/53/contribution/752 END:VEVENT BEGIN:VEVENT SUMMARY:Latest Results of Air Shower Simulation Programs CORSIKA and CONEX DTSTART;VALUE=DATE-TIME:20070705T161800Z DTEND;VALUE=DATE-TIME:20070705T163000Z DTSTAMP;VALUE=DATE-TIME:20260607T170201Z UID:indico-contribution-53-0-899@cern.ch DESCRIPTION:Speakers: Dr. PIEROG\, Tanguy (FZK\, IK)\nInterpretation of EA S measurements strongly depends on detailed air shower\nsimulations. The u ncertainty in the prediction of shower observables for different\nprimary particles and energies is currently dominated by differences between hadro nic\ninteraction models.The new models QGSJET-II and EPOS\, which reproduc e all major\nresults of existing accelerator data (including detailed data of RHIC experiments for\nEPOS)\, have been implemented in the air shower simulation programs CORSIKA and CONEX.\nWe will show predictions of these new models and compare them with those from older\nmodels such as QGSJET01 or SIBYLL. Results for air shower observables will be\ndiscussed in detai l.\n\nhttps://indico.nucleares.unam.mx/event/4/session/53/contribution/899 LOCATION:Merida\, Mexico Kabah (Holiday Inn) URL:https://indico.nucleares.unam.mx/event/4/session/53/contribution/899 END:VEVENT BEGIN:VEVENT SUMMARY:Features of geosynchrotron radio emission from CORSIKA-simulated a ir showers DTSTART;VALUE=DATE-TIME:20070705T163000Z DTEND;VALUE=DATE-TIME:20070705T164200Z DTSTAMP;VALUE=DATE-TIME:20260607T170201Z UID:indico-contribution-53-0-889@cern.ch DESCRIPTION:Speakers: Dr. HUEGE\, Tim (Forschungszentrum Karlsruhe)\nUsing our new Monte Carlo code REAS2\, geosynchrotron radio emission from \next ensive air showers can now be calculated on the basis of individual high \ nquality CORSIKA-simulated showers. We present an analysis of the radio \n emission properties predicted by REAS2\, with particular focus on shower t o \nshower fluctuations and primary particle composition effects which can now \nfor the first time be investigated in depth. Additionally\, more ge neral radio \nemission features and their dependence on parameters of the associated air \nshower are discussed with emphasis on the parameter range relevant to the \nPierre Auger Observatory.\n\nhttps://indico.nucleares.u nam.mx/event/4/session/53/contribution/889 LOCATION:Merida\, Mexico Kabah (Holiday Inn) URL:https://indico.nucleares.unam.mx/event/4/session/53/contribution/889 END:VEVENT END:VCALENDAR