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International Symposium on Future Directions in UHECR Physics

13–16 Feb 2012
CERN
Europe/Zurich timezone

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Contribution List

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  1. 0. Welcome address
    Sergio Bertolucci (CERN)
    13/02/2012, 14:00
  2. 1. History of UHECR research
    pierre sokolsky (university of Utah)
    13/02/2012, 14:15
  3. 2. Review of current status of measurements
    Paolo Privitera (Dipartimento di Fisica(RomaII))
    13/02/2012, 15:00
  4. 3. Acceleration and propagation
    Prof. Pasquale Blasi
    13/02/2012, 16:15
  5. 8. Review of model predictions on spectrum/composition
    Venya Berezinsky (INFN Laboratori Nazionali del Gran Sasso)
    13/02/2012, 16:50
  6. 5. Connecting accelerator experiments and cosmic ray showers
    Dr Tanguy Pierog (KIT)
    13/02/2012, 17:25
  7. 73. HiRes and TA Spectrum Measurements
    Douglas Bergman (U)
    14/02/2012, 09:10
    HiRes was the first experiment to observe the GZK Cutoff. This was accomplished using the fluorescence technique with monocular reconstruction with a heavy reliance on Data/MC comparison techniques borrowed from particle physics. This result was later confirmed using stereo reconstruction and by the Pierre Auger Observatory. The HiRes result is consistent with the original motivation for the...
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  8. 102. Measurement of the energy spectrum of cosmic rays at highest energies using the Pierre Auger Observatory
    Ioana Maris
    14/02/2012, 09:30
    We report a measurement of the flux of cosmic rays with unprecedented precision and statistics using the Pierre Auger Observatory. Based on fluorescence observations in coincidence with at least one surface detector we derive a spectrum for energies above 10^18 eV. We also report on the energy spectrum obtained with surface detector arrays of 1500m and 750m spacing for events with zenith...
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  9. 98. The Yakutsk array experiment: main results and future directions
    Anatoly Ivanov (Shafer Institute for Cosmophysical Research & Aeronomy)
    14/02/2012, 09:50
    The results of the Yakutsk array experiment aimed at investigations of ultra-high energy cosmic rays are presented. We outline the current status of the instrument and an outlook for future directions and areas of study.
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  10. 6. WG Review of UHECR spectrum data
    Yoshiki Tsunesada (Tokyo Institute of Technology)
    14/02/2012, 10:10
  11. 35. Nitrogen fluorescence in air for observing extensive air showers
    Dr Bianca Keilhauer (KIT)
    14/02/2012, 10:50
    Extensive air showers initiate the fluorescence emissions from nitrogen molecules in air. The UV-light is emitted isotropically and can be used for observing the longitudinal development of extensive air showers in the atmosphere over many kilometers. This measurement technique is well established since it has been used since many decades by several cosmic ray experiments. However, a...
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  12. 104. Mass Sensitive Observables of the Pierre Auger Observatory and Their Possible Implications
    Michael Unger (KIT - Karlsruhe Institute of Technology (DE))
    14/02/2012, 11:30
    In this presentation we will discuss measurements of the longitudinal development of air showers at the Pierre Auger Observatory. The longitudinal development can be directly observed by the fluorescence telescopes of Auger and we will present the results on the evolution of the average of the shower maximum and its fluctuations as a function of energy. Moreover, two observables from the...
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  13. 75. HiRes and TA Composition Measurements
    Yuichiro Tameda (Institute for Cosmic Ray Research, University of Tokyo)
    14/02/2012, 11:50
    In order to clarify the origin of ultra high energy cosmic rays (UHECRs), it is very important to determine the mass composition. The most effective strategy to determine the mass composition is Xmax technique. Xmax is the atmospheric depth of air shower maximum measured by fluorescence detectors (FDs). HiRes has reported Xmax measurement by FDs which indicated proton dominated mass...
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  14. 7. WG Review of UHECR composition data
    Dr Jose Bellido (The University of Adelaide)
    14/02/2012, 12:10
  15. 4. Particle physics connection
    Jonathan R. Ellis (CERN)
    14/02/2012, 14:00
  16. 9. Review of accelerator data of relevance to shower simulation
    Prof. Yoshitaka Itow (Nagoya University)
    14/02/2012, 14:40
  17. 23. Recent results from LHCf
    Gaku Mitsuka (Nagoya University (JP))
    14/02/2012, 15:20
    The Large Hadron Collider forward experiment measured very forward neutral particle spectra in LHC proton-proton collisions in early 2010. In this talk we will discuss the energy and transverse momentum spectra of neutral pion at the 7TeV proton-proton collision, and also present the inclusive photon energy spectra taken at the 900GeV collisions. The spectra in both collision energy are...
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  18. 99. Estimates of the proton-proton cross section at UHE energy
    Prof. Paolo Lipari (Universita di Roma I)
    14/02/2012, 15:40
    This contribution discusses possible methods to measure the proton-proton total cross section from observations of Ultra High Energy cosmic rays, and the theoretical uncertainties associated with these methods.
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  19. 84. Measurement of the proton-air cross section with the Pierre Auger Observatory
    Dr Ralf Matthias Ulrich (KIT - Karlsruhe Institute of Technology (DE))
    14/02/2012, 16:30
    Authorship: The Pierre Auger Collaboration. Using the tail of the distribution of the depth of shower maxima observed with the Pierre Auger Observatory, we derive an estimate of the proton-air cross section for particle production at center-of-mass energies of 57 TeV. Air showers observed with the fluorescence detector and at least one station of the surface array are analyzed in the...
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  20. 88. Measurements of the muon shower content at the Pierre Auger Observatory
    Alexey Yushkov
    14/02/2012, 16:50
    Various methods of estimation of the muonic part of the signal observed in the surface Cherenkov detectors have been developed within the Pierre Auger Collaboration in the recent years. Muon shower content, derived from data with these methods, is larger in comparison with predictions of QGJSET II and EPOS 1.99 interaction models. The zenith angle dependence of the muon deficit in simulations...
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  21. 103. New Physics at UHE energies
    Prof. Glennys Farrar (New York University)
    14/02/2012, 17:10
    Ultrahigh energy cosmic rays (UHECRs) are the highest energy particles in the Universe, recorded to have energies up to 100 million times greater than the LHC beams. Whether they are protons or nuclei and how they are accelerated are presently unknown. The particle cascades created when these UHECRs interact in the atmosphere are not well-described by simulations, but since the primary...
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  22. 29. New technique and results of cosmic ray investigations in the energy interval 10^15 – 10^19 eV
    Prof. Anatoly Petrukhin (MEPhI)
    14/02/2012, 17:30
    New technique of EAS investigations by means of the method of local muon density spectra (LMDS) is developed. Application of this method to investigations of inclined EAS allows exploration of CR energy interval from 10^15 to 10^19 eV by means of a relatively small detector with area ~100 m^2 due to very strong dependence of EAS muon density on zenith angle. During 2002-2007, long-term...
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  23. 10. WG Review of modeling and description of air showers
    Dr Ralph Engel (Forschungszentrum Karlsruhe)
    14/02/2012, 17:50
  24. 11. WG Review of anisotropy data
    Prof. Peter Tinyakov (Universite Libre de Bruxelles)
    15/02/2012, 09:00
  25. 12. WG Review of UHE multi-messenger data
    Dr Grigory Rubtsov (Institute for Nuclear Research of RAS), Markus Risse (University of Siegen)
    15/02/2012, 09:40
  26. 17. Review of TeV gamma-ray and neutrino data of relevance to UHECR
    Thomas Gaisser (University of Delaware)
    15/02/2012, 10:20
  27. 18. Review of interpretation of multi-messenger data
    Guenter Sigl (University of Hamburg)
    15/02/2012, 11:30
  28. 48. Ultra High Energy Nuclei Propagation and the Spectrum of UHECR
    Dr Roberto Aloisio (INAF - Osservatorio Arcetri Firenze)
    15/02/2012, 12:10
    We will discuss the main features of ultra high energy nuclei propagation in the intergalactic space, presenting a novel analytical approach to pursue such studies. We will also discuss a new interpretation of the experimental observations of UHECR.
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  29. 28. Transition from Galactic to Extragalactic Cosmic Rays and cosmic ray anisotropy
    Dmitri Semikoz (A)
    15/02/2012, 12:30
    We constrain the energy at which the transition from Galactic to extragalactic cosmic rays occurs by computing the anisotropy at Earth of cosmic rays emitted by Galactic sources. Since the diffusion approximation starts to loose its validity for E/Z >10^(16-17) eV, we propagate individual cosmic rays using Galactic magnetic field models and taking into account both their regular and turbulent...
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  30. 32. Constraints on inductive acceleration of UHECRs in astrophysical sources.
    Sergey Troitsky (Russian Academy of Sciences (RU))
    15/02/2012, 14:00
    I discuss possible sites of acceleration of UHECRs by regular electromagnetic fields in astrophysical sources. A plausible mechanism of acceleration works in the vicinity of supermassive black holes in active galactic nuclei. It is motivated by relatively high density of UHECR sources as suggested by both statistics of clustering and the shape of the GZK cutoff. However, I demonstrate that the...
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  31. 65. Deflection of ultra-high energy heavy nuclei in magnetic fields
    Gwenael Giacinti (NTNU Trondheim, Norway)
    15/02/2012, 14:20
    In this work, we investigate the impacts a potential shift towards a heavy composition at the end of the spectrum would have on the future data. We present detailed simulations for the propagation of ultra-high energy heavy nuclei, with E > 60 EeV, within recent Galactic Magnetic Field (GMF) models. We both consider the regular and turbulent components of the GMF. We show that with UHE heavy...
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  32. 22. Are UHECR and multiplet also galactic?
    Prof. Daniele Fargion (Rome University 1 Sapienza and INFN)
    15/02/2012, 14:40
    Since last decades UHECR models teach us that at EeV energy UHECR are mostly of extragalactic origin. Moreover earliest (2007) AUGER at 55 EeV energy events were suggesting an UHECR GZK cut off and arrival map correlated with super-galactic plane, SGP,inside the expected GZK volume traced by protons. However the same AUGER composition imprint favoured nuclei (heavy or light) and not...
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  33. 52. Extragalactic and galactic sources: new evidence, new challenges, new opportunities
    Alexander Kusenko (UCLA)
    15/02/2012, 15:00
    First, I will present new evidence, from gamma-ray observations of blazars, that cosmic rays are, indeed, accelerated in AGNs. Second, I will discuss the plausibility of a substantial contribution of transient galactic sources, such as past GRBs and hypernovae, to the observed flux of cosmic-ray nuclei. The likely contamination of UHECR data by the nuclei from past galactic stellar...
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  34. 96. The Need for Hard Spectrum Local Sources of UHECR Nuclei
    Dr Andrew Taylor (ISDC, University of Geneva)
    15/02/2012, 15:20
    Using the recent Auger energy spectrum and composition analysis results, an investigation is carried out into the requirements placed on the UHECR sources. The spatial distribution of these sources is investigated along with the energy distribution of UHECR they output. These investigations reveal the need for local UHECR sources which output a hard spectrum of intermediate/heavy...
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  35. 37. A strategy to unveil transient sources of ultra-high-energy cosmic rays
    Hajime Takami (M)
    15/02/2012, 15:40
    The origin of ultra-high-energy (UHE) cosmic rays (CRs) is still unknown and one of the biggest mysteries in modern astrophysics. The uncertainty of their composition makes this problem more complicated. If protons are dominant in UHECRs and are produced by phenomena related to astrophysical jets or outflows, there are few steady source candidates in local Universe which have luminosities...
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  36. 47. Reconstruction of Muon Production Depth in grounded array based on the TTC (Time Track Complementarity) method
    Dr Michelangelo Ambrosio (INFN Napoli)
    15/02/2012, 16:30
    The muon longitudinal profile along the shower axis is strictly connected to the primary nature and primary hadronic interaction with air nuclei. The detection of muonic component inside showers generated by Very High Energy Cosmic Rays provides a very powerful tool for sensing high energy interactions between cosmic ray particles and air molecules. Fundamental parameters as the interaction...
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  37. 30. What the radio signal tells about the cosmic-ray air shower.
    Prof. Olaf Scholten (KVI/Univ. of Groningen)
    15/02/2012, 16:50
    The physics of radio emission from cosmic-ray induced air showers is shortly summarized. It will be shown that the radio signal at different distances from the shower axis provides complementary information of the longitudinal shower evolution, in particular the early part, and the distribution of the electrons in the shower core. This complements the information obtained from surface,...
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  38. 95. Results from the Auger Engineering Radio Array
    Ad van den Berg (University of Groningen)
    15/02/2012, 17:10
    The Auger Engineering Radio Array (AERA) is one of the low energy enhancements of the Pierre Auger Observatory. AERA is based on experiences obtained with the LOPES and CODALEMA experiments in Europe and aims to study in detail the emission mechanism of radio signals in the MHz region from extensive air showers. The data from AERA will be used to assess the sensitivity of MHz radiation to the...
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  39. 92. First results from the Microwave Air Yield Beam Experiment (MAYBE): measurement of GHz radiation for Ultra-High Energy Cosmic Rays detection
    Mr Christopher Williams (University of Chicago & KICP)
    15/02/2012, 17:30
    We present measurements of microwave emission from an electron-beam induced air plasma performed at the 3 MeV electron Van de Graaff facility of the Argonne National Laboratory. Results include the emission spectrum between 1 and 15 GHz, the polarization of the microwave radiation and the scaling of the emitted power with respect to beam intensity. MAYBE measurements provide further insight on...
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  40. 51. Status of the microwave detection of cosmic rays program at the Pierre Auger Observatory
    Pedro Facal San Luis (U)
    15/02/2012, 17:50
    Radiation in the microwave band from the passage of charged particles through air has been detected in the laboratory. Applied to extensive air showers this radiation could provide a novel technique for ultra-high energy cosmic rays detection over large area, with 100% duty cycle and virtually no atmospheric attenuation. Detection in the GHz band is being actively pursued at the Pierre...
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  41. 68. Microwave emission from extensive air showers as seen by CROME
    Radomir Smida (Karlsruhe Institute of Technology)
    15/02/2012, 18:10
    A measurement of extensive air showers in the microwave range has been considered as a possible successor to current measurement techniques. The CROME (Cosmic Ray Observation via Microwave Emission) experiment consisting of several parabolic antennas measures radiation from the atmosphere in coincidence with air showers detected by the KASCADE-Grande experiment. Nanosecond radio pulses are...
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  42. 74. TARA: Forward-Scattered Radar Detection of UHECR at the Telescope Array
    Prof. John Belz (University of Utah)
    15/02/2012, 18:25
    Increased event statistics will be required to definitively answer the question of the origin(s) of Ultra-High Energy Cosmic Rays (UHECR). Using current technologies however, achieving the necessary statistics may be financially and practically impossible. We describe the status and plans of the TARA project, an effort to detect Ultra-High-Energy Cosmic Rays by their forward scattered or...
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  43. 27. On the astrophysical value of larger, yet achievable UHECR detectors
    Etienne Parizot (Université Paris Diderot / APC)
    16/02/2012, 09:00
    The last decade has established UHECR physics as a phenomenologically rich and experimentally mature science. Key observations related to the UHECR energy spectrum, composition and distribution over the sky have clarified a few basic open question, and raised new, unexpected ones. The absence of a clear signal of anisotropy or correlation with some classes of astrophysical objects, although in...
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  44. 14. Review of space-based approaches
    Prof. Toshikazu Ebizusaki (Riken)
    16/02/2012, 09:20
    The idea looking down the Earth to observe air-showers from space is not new. In fact, John Linsley already in 1979, has proposed to use a space telescope for the observation of UV emission from air-showers. Since then, a few missions are proposed to achieve this next generation technology for the exploration of the high energy universe. Space-based ultra-high energy observatories have...
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  45. 55. The JEM-EUSO mission: context and status
    Prof. Andrea Santangelo (University Tuebingen)
    16/02/2012, 10:00
    JEM-EUSO, the Extreme Universe Space Observatory on board the Japanese Experiment Module of the ISS (International Space Station), is expected, within this decade, to explore the ultra-high energy (UHE) Universe with unprecedentedly large effective area and uniform exposure. In this talk we first summarize the scientific context of the mission, including its scientific requirements, and we...
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  46. 56. Performances of JEM-EUSO
    Dr Mario Bertaina (University Torino)
    16/02/2012, 10:20
    Designed as the first mission exploring the Ultra High Energy Universe from space, JEM-EUSO will monitor the Earth's atmosphere to record UV (300-400 nm) tracks generated by Extensive Air Showers produced by UHECR primaries. In this contribution, the expected performances of JEM-EUSO will be reviewed. In particular, by detailed simulation studies performed with realistic trigger and...
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  47. 69. Interdisciplinary Science with Large Aperture Cosmic Ray Detectors
    Lawrence Wiencke (Colorado School of Mines)
    16/02/2012, 10:40
    Large aperture detector systems to measure high energy cosmic rays, also offer unique opportunities in other areas of science. Disciplines include geophysics such as seismic and volcanic activity, and atmospheric science ranging from clouds to lightening to aerosols to optical transients. This talk will discuss potential opportunities based on the ongoing experience of the Pierre Auger Observatory.
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  48. 36. Ultra high energy particle physics and astrophysics. The need for multicomponent EAS measurement and primary particle identification.
    Antoine Letessier-Selvon (LPNHE CNRS/In2p3)
    16/02/2012, 11:30
    We show that a fundamental element for future generations of UHECR observatories is the multicomponent measurements of extensive air shower. Such measurements may allow an event-by-event identification of the primary cosmic ray type and would radically impact on the study of various aspects of UHECR physics. From detailed hadronic physics studies to sources discovery via Galactic and...
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  49. 90. A conceptual design for a large ground array of Fluorescence Detectors
    Prof. Paolo Privitera (University of Chicago)
    16/02/2012, 11:50
    In order to understand the composition and hadronic interactions of ultra-high energy cosmic rays above $10^19.5$ eV, currently limited by statistics, the next generation of experiments must provide a precise measurement of the maximum shower development with a large aperture. We propose a novel design of fluorescence detectors arranged in a large ($\ge 40000$ km$^2$) ground array. The shower...
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  50. 78. Future plans of the Telescope Array experiment
    Shoichi Ogio (Osaka City University)
    16/02/2012, 12:10
    The Telescope Array (TA) experiment is the world’s first and the only air shower detector to be directly calibrated by an on-site accelerator beam. For wider and deeper understanding of cosmic rays via high precision measurements, we have several future plans for the TA experiment. One extension plan is called TA low energy extension (TALE), to extend the sensitive energy range to 10^16.5 eV...
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  51. 16. Theory and phenomenology: summary & outlook
    Angela Olinto (The University of Chicago)
    16/02/2012, 14:00
  52. 15. Experimental summary & future prospects
    Prof. Masaki Fukushima (University Tokyo)
    16/02/2012, 14:40
  53. 20. Open discussion
    Alan Watson (University of Birmingham (GB))
    16/02/2012, 15:20
  54. 94. A HiSCORE prototype at the Tunka-EAS array
    Dr Ralf Wischnewski (DESY Zeuthen)
    poster
    A proof-of-principle experiment for the HiSCORE detector, a ground-based large-area wideangle γ -ray and cosmic-ray experiment focusing on the energy range beyond 10 TeV and up to 1 EeV, is planned at the Tunka-133 Cherenkov EAS array. The HiSCORE prototype units will be installed in 2012 and 2013. The calibration of the new detectors will be done by simultaneous observations with the...
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  55. 81. A measurement of the muon number in showers using inclined events detected at the Pierre Auger Observatory
    Dr Gonzalo Rodriguez (For the Pierre Auger Collaboration)
    poster
    The average muon content of measured showers with zenith angles between 60 and 80 degrees detected at the Pierre Auger Observatory is obtained as a function of shower energy using a reconstruction method specifically designed for inclined showers and the hybrid character of the detector. The reconstruction of inclined showers relies on a comparison between the measured signals at ground and...
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  56. 31. A method to search for correlations of UHECR masses with the large scale structures in the local galaxy density field
    Anatoly Ivanov (Shafer Institute for Cosmophysical Research & Aeronomy)
    poster
    One of the main goals of investigations using present and future giant extensive air shower (EAS) arrays is the mass composition of ultra-high energy cosmic rays (UHECRs). A new approach to the problem is presented, combining analysis of arrival directions with the statistical test of paired EAS samples. An idea of the method is to search for possible correlations of UHECR masses with their...
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  57. 66. Absolute energy calibration of the Telescope Array fluorescence detector with an electron linear accelerator
    Dr Shibata Tatsunobu (ICRR, Universty of Tokyo)
    poster
    The Electron Light Source (ELS) is a new light source for the absolute energy calibration of cosmic ray Fluorescence Detector (FD) telescopes. The ELS is a compact electron linear accelerator with a typical output of 10^9 electrons per pulse at 40MeV. We fire the electron beam vertically into the air 100 m in front of the telescope. The electron beam excites the gases of the atmosphere in the...
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  58. 71. Anisotropy search above 1 EeV using the Telescope Array surface detector data
    Dmitri Ivanov
    poster
    In 1999, the Akeno Giant Air Shower Array (AGASA) reported a 4 sigma excess in the 1 - 2 EeV cosmic ray intensity near the Galactic Center (G.C.) and a 4 sigma deficit near the Galactic Anti-Center (G.A.C.) . In 2007, a similar 3.5 sigma deficit near the G.A.C. was seen by the High Resolution Fly's Eye (HiRes) experiment, while a search near the G.C. was inconclusive. We have performed an...
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  59. 105. Anisotropy studies with the Pierre Auger Observatory
    Piera Luisa Ghia (LPNHE-CNRS)
    poster
    We report recent results from the Pierre Auger Observatory about the anisotropy of ultra-high energy cosmic ray arrival directions. In the EeV energy range, we present the results on a search for a large scale dipolar anisotropy pattern. In the same energy range, we show the results of a search for localized excesses of cosmic ray neutrons. For cosmic rays with energies above 20 EeV, we...
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  60. 57. Astrophysics questions to be answered by JEM-EUSO
    Gustavo Medina Tanco (Instituto de Ciencias Nucleares - UNAM)
    poster
    JEM-EUSO will be the first space observatory to explore the UHECR sky. It will use the fluorescence technique to achieve a 3D-reconstruction of extensive air shower tracks, achieving unprecedentedly large effective aperture and a very uniform exposure in declination. These characteristics will allow precision measurements of the energy spectrum at the highest energies, including the region of...
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  61. 41. Atmospheric monitor for Telescope Array experiment
    Takayuki Tomida (University of Yamanashi / Honda-lab.)
    poster
    Atmospheric monitoring is very important for the observation of air showers by the air fluorescence technique. In the Telescope Array (TA) experiment, the LIDAR (LIght Detection And Ranging) system and the CLF (Central Laser Facility) system are used for the measurement of atmospheric transparency. The LIDAR system is located southeast of TA site, and the CLF is located in the center of...
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  62. 46. AugerNext: Innovative Research Studies for the Next Generation Ground-Based Ultra-High Energy Cosmic-Ray Experiment
    Andreas Haungs (Forschungszentrum Karlsruhe)
    poster
    Andreas Haungs and the AugerNext consortium for the Pierre Auger Collaboration The findings so far of the Pierre Auger Observatory and the Telescope Array define the requirements for a possible next generation experiment: it needs to be considerably increased in size, it needs a better sensitivity to composition, and it should cover the full sky. AugerNext aims to perform innovative...
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  63. 62. Calibration and testing of a prototype of the JEM-EUSO telescope on Telescope Array site
    Marco Casolino (INFN)
    poster
    The TA-EUSO project aims to install a prototype of the JEM-EUSO telescope on the Telescope Array site in Black Rock Mesa, Utah. The detector consists of one Photo Detector Module (PDM), identical to the 137 present on the JEM-EUSO focal surface. Each PDM is composed by 36 Hamamatsu multi-anode photomultipliers (64 channels per tube), for a total of 2304 channels. Front-End readout is performed...
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  64. 60. Calibration of the JEM-EUSO detector
    Naoto Sakaki (Aoyama Gakuin University)
    poster
    In order to unveil the mystery of ultra high energy cosmic rays (UHECR's), JEM-EUSO (Extreme Universe Space Observatory on board of the Japan Experiment Module), launched ~2017, will observe extensive air showers induced by UHECR's from the International Space Station orbit with a huge acceptance. An accurate calibration of the JEM-EUSO instrument, which consists of Fresnel optics and a...
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  65. 63. Challenge and objectives of the radio detection technique from the CODALEMA collaboration viewpoint
    Dr Arnaud Bellétoile (Subatech)
    poster
    The interest of the cosmic ray community toward radio detection has largely grown over the past decade and numerous related physics programs have been developed besides pioneering experiments like CODALEMA and LOPES. However, this very promising new detection tool is still under development and a number of objectives have to be met. We intend to sketch an up to date picture of the radio...
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  66. 42. Characteristics of p-air interactions in the ultra-high energy region measured at the Yakutsk EAS array
    Dr Stanislav Knurenko (Shafer Institute for Cosmophysical Research)
    poster
    We present estimation of proton-air inelastic interaction cross-section obtained for different energy values are. Results are compared with different hadron interaction models.
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  67. 43. Cosmic ray energy spectrum and mass composition at energies 1015 - 1018 eV
    Dr Stanislav Knurenko (Shafer Institute for cosmophysical research)
    poster
    A spectrum of cosmic rays within energy range 1015-3*1017 eV was derived from the data of the small Cherenkov setup, which is a part of the Yakutsk complex EAS array. In this, work a new series of observation is covered. These observations lasted from 2000 till 2010 and resulted in increased number of registered events within interval 1016-1018 eV, which in turn made it possible to reproduce...
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  68. 50. Development of new photon detection device for Cerenkov and fluorescence radiation
    Carla Aramo (INFN Napoli)
    poster
    Recent progress on development of new solid state detectors allowed the use of finely pixelled photocathodes based on the use of silicon semiconductors. SiPM detectors seem to be an ideal tool for detection of Cerenkov and fluorescence light in spite of their not yet resolved criticism for operating temperature and intrinsic noise. The main disadvantage of SiPM in this case is the poor...
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  69. 54. Disentangling the Air Shower Components Using Scintillator and Water Cherenkov Detectors.
    Javier G. Gonzalez (KIT)
    poster
    The current challenge in studying ultra-high energy cosmic rays is inferring the primary mass-composition. In order to get a better handle on mass-composition it is vital that we disentangle the contributions from the different components of the air shower, as this relates to the primary mass as well as possible systematic uncertainties arising from the use of Monte Carlo hadronic...
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  70. 45. Extension of the dynamic range of large photocathode PMTs for a UHECR detector
    Dr Carlo Morello (INAF-INFN)
    poster
    Ground arrays for UHECR shower detection based on traditional counters, water Cherenkov tanks or scintillator modules, are unavoidably limited by the saturation suffered by the counters nearest to the shower axis and exposed to the largest particle density. The incomplete response from these detectors hampers the knowledge of the shower development near the shower core, limiting the...
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  71. 34. FAMOUS - A Prototype Silicon-Photomultiplier-Telescope for the Fluorescence Detection of Ultra-High-Energy Cosmic Rays
    Maurice Stephan (RWTH Aachen University)
    poster
    Due to their high photon detection efficiency, silicon photomultipliers (SiPMs) promise to increase the sensitivity of today’s fluorescence telescopes which use photomultiplier tubes to detect light originating from extensive air showers. On the other hand drawbacks like a small sensitive area, a strong temperature dependence, a high noise rate and a reduced dynamic range have to be...
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  72. 85. Hadronic Interactions in Extensive Air Showers
    Dr Ralf Matthias Ulrich (KIT - Karlsruhe Institute of Technology (DE))
    poster
    The detailed analysis of cosmic ray induced extensive air showers requires a good knowledge of hadronic particle production in the shower cascade. For ultra-high energy cosmic rays this depends on the extrapolation of the available accelerator data by the models over wide ranges in energy but also into the forward phase space. We demonstrate how the extrapolation of different particle...
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  73. 26. High Energy Neutrinos from Charm in Astrophysical Sources
    Prof. Ina Sarcevic (University of Arizona)
    poster
    We present results for neutrino fluxes from astrophysical sources. We show that charm production enhances a flux of very high energy neutrinos from astrophysical sources with jets driven by central engines, such as gamma ray bursts or supernovae with jets. The neutrino flux from semi-leptonic decays of charmed mesons is subject to much less hadronic and radiative cooling than the...
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  74. 80. Hybrid analysis for the Telescope Array
    Dr Daisuke Ikeda (Institute for Cosmic Ray Research, University of Tokyo)
    poster
    The Telescope Array (TA) experiment is the largest Ultra-High Energy Cosmic Ray (UHECR) observatory in the northern hemisphere, and is located in the west desert of Utah. It is a hybrid UHECR experiment using two types of detectors: three stations of Fluorescence Detectors (FDs) and 507 Surface Detectors (SDs). The three FD stations (at Middle Drum (MD), Long Ridge (LR), and Black Rock (BR))...
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  75. 53. LHCf plan for p-Pb forward particle measurement
    Dr T. Sako (Nagoya University)
    poster
    LHCf is planning to measure very forward particle emission in the LHC p-Pb collisions foreseen in the end of 2012. The measurement is expected to constrain the nuclear effect in the forward particle emission relevant to the CR-Air interaction. Model discrimination power of this measurement is presented together with some detail in technical feasibility.
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  76. 101. Measurement of the Muon Production Depth
    Dr Diego Garcia Gammez (LAL/University Paris-Sud)
    poster
    The surface detector array of the Pierre Auger Observatory allows for an experimental estimation of the muonic longitudinal development of extensive air showers in an indirect way. From the FADC traces of the surface detectors far from the core it is possible to reconstruct the Muon Production Depth distribution (MPD). We characterize the goodness of this reconstruction for zenith angles...
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  77. 100. Measurements of the Longitudinal Shower Development with the Pierre Auger Observatory
    Prof. de Souza Vitor (IFSC-USP)
    poster
    In this work we explain how the Pierre Auger Observatory measures and reconstructs the longitudinal development of air showers. The measurement of the energy deposit in the atmosphere by the detection of the emitted fluorescence light is going to be briefly reviewed and the reconstruction procedure is going to be explained in details. The two main outputs of this analysis are: a) the...
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  78. 87. Missing energy estimate in the light of the muon discrepancy
    Dr Matias Tueros (Universidad de Santiago de Compostela)
    poster
    The determination of the primary energy of extensive air showers using the fluorescence technique requires an estimation of the energy carried away by particles (muons, neutrinos) that do not deposit all their energy in the atmosphere. This estimation is typically made using Monte Carlo simulations and is thus dependent on the hadronic interaction model, specially on the predictions for...
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  79. 33. Multimuon detector for quasi horizontal EAS
    Piero Spillantini (I)
    poster
    Quasi horizontal showers produced by charged CR and gammas are constituted exclusively by muons, the other components being absorbed in the thick layer of the atmosphere they must cross to reach a detection system on the Earth surface. Their transverse dimensions are increased by the distance they must travel as well by the terrestrial magnetic field which tends to extend muon cloud and...
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  80. 91. Neutrinos and Gamma Rays from the First Ultra-High Energy Cosmic Rays in the Universe
    Susumu Inoue (Institute for Cosmic Ray Research, University of Tokyo)
    poster
    Population III stars, the very first, metal-free stars to form in the Universe, may give rise to gamma-ray bursts (GRBs) with much greater energy compared to ordinary GRBs. Such Pop III GRBs can produce ultra-high energy cosmic rays (UHECRs) with a correspondingly larger energy budget. Despite their typically high redshifts (z~10-20) and modest expected burst rates, the consequent cosmogenic...
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  81. 25. On the energy deposition by electrons in air and the accurate determination of the air fluorescence yield
    Fernando Arqueros (UCM)
    poster
    The uncertainty in the absolute value of the fluorescence yield FY still puts a severe limit on the accuracy of the primary energy of UHECRs. Accurate measurements of the fluorescence yield are being carried out in many laboratories around the world. The determination of the energy deposited in the field of view of the collision chamber is subjected to uncertainties that have to be taken into...
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  82. 89. Radar reflection off extensive air showers
    Dr Jaroslaw Stasielak (Institute of Nuclear Physics PAN, Krakow, Poland)
    poster
    We investigate the possibility of detecting extensive air showers by the radar technique. Considering a bistatic radar system and different shower geometries, we simulate reflection of radio waves off the static plasma produced by the shower in the air. Using the Thompson cross-section for radio wave reflection, we obtain the time evolution of the signal received by the antennas. The frequency...
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  83. 72. RASTA - Radio detection of cosmic rays at South Pole
    Larissa Paul (RWTH Aachen University)
    poster
    The Radio Air Shower Test Array (RASTA) project explores the opportunity to enhance the IceCube Neutrino Observatory by measuring cosmic ray air-showers using radio detection. Radio signals in the 10-250 MHz region are produced by the deflection of the charged constituents of cascades in the Earth's magnetic field, providing a calorimetric measurement of the electron/positron component of...
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  84. 82. Search for correlation with the TA events and various classes of objects
    Kazuki Tsutsumi
    poster
    The origin of ultra-high energy cosmic rays (UHECRs) is still a mystery in astrophysics. In order to clarify the origin of UHECRs, their arrival directions are of special importance. We searched for correlations between the arrival directions of the UHECR events observed by Telescope Array (TA) with energies greater than 10EeV and the positions of astronomical objects of various classes. The...
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  85. 77. Search for molecular bremsstrahlung radiation signals in Ku band with coincidental operations of radio telescopes with air shower detectors
    Shoichi Ogio (Osaka City University)
    poster
    Microwave radiation from extensive air showers is expected to provide a new technique to observe UHECR. We developed a set of radio telescopes each of which consists of a 0.45 m parabola antenna in Ku band, a power detector and a waveform digitizer. Firstly, we had coincidentally operated the radio telescopes with an air shower array consists of nine plastic scintillators with about 10 m...
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  86. 93. Search for ultra-high energy neutrinos at the Pierre Auger Observatory
    Sergio Navas Concha (Universidad de Granada (ES))
    poster
    The Pierre Auger Observatory has the capability of detecting ultra-high energy neutrinos of all flavours. They interact through charged and neutral currents in the atmosphere (downward-going) and through the ``Earth-skimming'' mechanism (upward-going). The main challenge in detecting ultra-high energy neutrinos with the Pierre Auger Observatory is to identify a neutrino-induced...
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  87. 76. Search for ultra-high energy photons and neutrinos using Telescope Array surface detector
    Dr Grigory Rubtsov (Institute for Nuclear Research of RAS)
    poster
    We search for ultra-high energy photons by analyzing geometrical properties of shower fronts of events registered by the Telescope Array surface detector. By making use of an event-by-event statistical method, we derive upper limits on the absolute flux of primary photons with energies above 10^19, 10^19.5 and above 10^20 eV based on the three years data from Telescope Array surface detector...
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  88. 86. Search for ultra-high energy photons at the Pierre Auger Observatory
    Dr Viviana Scherini (University of Milano and INFN Milano (Italy))
    poster
    The Pierre Auger Observatory has a significant sensitivity to search for ultra-high energy photons using data from the ground detector alone or in hybrid mode. Recent upper limits on the photon flux are already below the percent-level with regard to the total flux. The current status and details of the analysis methods are presented.
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  89. 79. Searches for sources of astrophysical neutrinos with the ANTARES detector
    Fabian Schüssler (CEA)
    poster
    The first years of data from the ANTARES neutrino telescope have been extensively used to search for neutrinos of astrophysical origin. In this contribution an overview over various analysis will be given. We will present searches for point-like neutrino sources and the search for a high energy excess over the atmospheric neutrino flux. Exploiting the close connection between gamma ray and...
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  90. 83. Simulation of Ultra-High Energy Cosmic Ray Propagation
    Dr Peter Schiffer (University of Hamburg)
    poster
    A future Ultra-High Energy Cosmic Ray (UHECR) Observatory will provide an unprecedented amount of high quality UHECR data. The astrophysical interpretation of this data requires a detailed Monte Carlo simulation of UHECR propagation. The publicly available code CRPropa allows such a simulation, taking into account all relevant energy losses in ambient photon fields and deflections in...
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  91. 67. TA anisotropy update
    Prof. Peter Tinyakov (Universite Libre de Bruxelles)
    poster
    We search for anisotropy of ultra-high energy cosmic ray (UHECR) events collected by the Telescope Array detector in the first 3.5 years of operation. Following earlier studies, we consider the event sets with energy thresholds of E>10 EeV, E>40 EeV, and E>57 EeV. First, we calculate the autocorrelation function of the cosmic ray events and find no significant deviations from...
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  92. 49. The Air Microwave Yield (AMY) experiment to measure the GHz emission from air shower plasmas.
    Valerio Verzi (INFN)
    poster
    The aim of the AMY experiment is to measure and characterize the GHz radiation emitted from an electrom beam induced air plasma. The final purpose is to investigate the new microwave detection techinque for Ultra-High Energy Cosmic Rays. We present the results of a first test performed at the Beam Test Facility (BTF) of Frascati INFN National Laboratories. The measurements have been...
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  93. 59. The Atmospheric Monitoring System of the JEM-EUSO Space Mission
    Maria Dolores Rodriguez Frias (University Alcala, Madrid)
    poster
    An Atmospheric Monitoring System (AMS) is mandatory and a key element of a space-based mission which aims to detect Ultra-High Energy Cosmic Rays. JEM-EUSO has a dedicated atmospheric monitoring system that plays a fundamental role in our understanding of the atmospheric conditions in the field of view of the telescope. Our AMS consists of an infrared camera and a LIDAR device that are being...
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  94. 44. The composition of the primary particles at energies 3∙1017 -3∙1019 eV
    Dr Stanislav Knurenko (Shafer Institute for cosmophysical research)
    poster
    Calculations of signals in surface and underground scintillation detectors of the Yakutsk array from particles of extensive air showers in terms of QGSJET-II and GEISHA 2002 models with the help of the CORSIKA 6.616 and GEANT4 codes with parameter ε=10-8 of the thinning procedures have been carried out to estimate muon fraction at 600 m from the shower axis at energies 3∙1017 -3∙1019 eV....
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  95. 40. The current status of LHCf experiment and Future plan
    Kentaro Kawade (Nagoya University (JP))
    poster
    The Large Hadron Collider forward (LHCf) experiment has successfully finished the first phase of data taking at LHC $\sqrt{s}=0.9TeV and 7TeV$ proton-proton collisions in 2010. In this poster, the status and future plan of the LHCf experiment is presented.
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  96. 61. The EUSO-BALLOON pathfinder
    Prof. Peter von Ballmoos (IRAP Toulouse)
    poster
    EUSO-BALLOON is a pathfinder mission for the Extreme Universe Space Observatory on-board the Japanese Experiment Module (JEM-EUSO) mission. Through a series of stratospheric balloon flights performed by the French Space Agency CNES, EUSO-BALLOON will serve as an evolutive test-bench for all the key technologies of JEM-EUSO, as well as other future missions dedicated to the observation of...
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  97. 24. The impact of the fluorescence yield on the energy reconstruction of UHECR showers
    Fernando Arqueros (UCM)
    poster
    The fluorescence yield FY is a key parameter in the determination of the primary energy of UHECRs using the fluorescence technique. For a given fluorescence signal, the reconstructed primary energy is strongly dependent on the assumed FY parameters (absolute value, wavelength spectrum, pressure dependence, etc.). Auger, HiRes and TA experiments have used different FY assumptions. In this work...
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  98. 38. The Pierre Auger Research and Development Array (RDA) in southeastern Colorado – R&D for a giant ground array
    Fred Sarazin (C)
    poster
    The Pierre Auger Research and Development Array was originally designed to be the precursor of the northern Auger observatory, an hybrid array of 4400 surface detectors and 39 fluorescence detectors deployed over 8,000 square miles. It is conceived as a test bed aiming at validating an improved and more cost-effective 1-PMT (instead of 3 in the current design) surface detector design and a new...
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  99. 70. The Telescope Array Low Energy Extension (TALE)
    Gordon Thomson (University of Utah)
    poster
    The Telescope Array Low Energy Extension (TALE) will consist of an array of scintillation counters and fluorescence telescopes designed to lower the minimum energy of the Telescope Array (TA) experiment by about an order of magnitude. The fluorescence detector will have 10 telescopes which cover elevation angles between 31 and 59 degrees, and 95 degrees in azimuth. There will be 45...
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  100. 64. Tunka-133: the First Results and Perspectives
    VASILY PROSIN (S)
    poster
    Registration of EAS Cherenkov light at the new Tunka-133 array let us use the Earth atmosphere as a huge calorimeter for very high energy primary particles. The preliminary all particles energy spectrum in the range 6.1015 – 1018 eV is collected during two winter seasons since 2009 till 2011. The depth of EAS maximum Xmax for each event is derived from the measured steepness of the Cherenkov...
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  101. 39. Using CORSIKA to quantify Telescope Array surface detector response
    Dr Benjamin Stokes (University of Utah)
    poster
    Historically, studies of surface detector response have been severely limited by the inability to simulate charge density fluctuations at the distance scale of individual detector units. We present a two-prong solution. First, we have developed a technique that allows us to run the unmodified CORSIKA in parallel mode. This has allowed us to simulate $\sim100$ non-thinned CORSIKA showers in the...
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