Description
All of the posters in this session will also be on display in Poster Session II.
Dr
Alexander Borisov
(P.N.Lebedev Physical Institute, RAS)
29/06/2010, 16:30
Extensive air shower experiments
Poster
A recommencement of CR researches with a unique X-Ray emulsion chamber (XREC) located at a high-altitude experimental site at the Pamirs (4360 m a.s.l.) in the framework of the Pamir-Chacaltaya International Scientific Research Center, recently established by the Governments of the Russian Federation and Tajikistan (2008), opens up a possibility for deep upgrading of the experimental setup...
Mr
Isaac Myers
(University of Utah Department of Physics and Astronomy)
29/06/2010, 16:30
Experiments above the Ankle
Poster
Progress in the study of high energy cosmic ray physics is limited by low flux. In order to collect substantial statistics above $10^{19}$~eV, the two largest ground arrays currently in operation cover 800~$\mbox{km}^2$ (Telescope Array, Utah) and 3000~$\mbox{km}^2$ (Auger Observatory, Argentina). The logistics and cost of an order-of-magnitude increase in ground array aperture is prohibitive....
Dr
Vera Yurievna Sinitsyna
(P.N. Lebedev Physical Institute)
29/06/2010, 16:30
Anisotropy
Poster
Extragalactic diffuse background radiation blocks the propagation of TeV γ-ray over large distances (z>0.1) by producing electron-positron pairs. As a result, primary spectrum of gamma-source is changed, depending on spectrum of background light. So, a hard spectra of Active Galactic Nuclei with high red shifts of 0.03 – 1.8 allow to determine an absorption by Extragalactic Background Light...
Prof.
Sergey Shaulov
(FIAN)
29/06/2010, 16:30
Emulsion chambers
Poster
The Ne spectra for EAS and EAS with gamma-families are analyzed (Experiment "Hadron"-Tien-Shan).Presence thin structure (peaks) in EAS spectrum with gamma-families and necessity of simultaneous approximation of two spectra (EAS and EAS+γ) essentially the same mass composition limits possible models of nucleus individual spectra. The elementary variant of model when spectra of all five nuclear...
Dr
Benjamin Stokes
(University of Utah)
29/06/2010, 16:30
Extensive air shower experiments
Poster
The history of ultra-high energy cosmic ray observation is now approaching 50 years. However, until quite recently, the full simulation of an extensive air shower was computationally impossible due to the vast quantity of daughter particles involved. However, with the advent of modern cluster computing, simulations that once would have taken years to complete can be done in a matter of hours...
Dr
Nobusuke Takahashi
(Hirosaki University)
29/06/2010, 16:30
Muons
Poster
By using the integral methods in the muon propagation through water, we calculate the range fluctuation of high and ultra high energy muons. Many authors divide all radiative processes into two part, namely, the continuous part and stochastic part in their Monte Carlo simulation in order to consider the fluctuation in the both range and energies of the muons, while we treat all radiative...
Prof.
Sergei Sinegovsky
(Institute of Applied Physics, Irkutsk State University)
29/06/2010, 16:30
Hadronic cross sections
Poster
High-energy neutrinos, arising from decays of mesons that were produced through the cosmic rays collisions with air nuclei, form unavoidable background noise in the astrophysical neutrino detection problem. The atmospheric neutrino flux above 1 PeV should be supposedly dominated by the contribution of charmed particle decays. These (prompt) neutrinos originated from decays of massive...
Dr
Alexander Borisov
(P.N.Lebedev Physical Institute, RAS)
29/06/2010, 16:30
Emulsion chambers
Poster
Analysis of various data accumulated in X-ray emulsion chamber experiments, especially, data on gamma–hadron families with unusual characteristics (Centauros, aligned events etc.), requires a comprehensive computer code to simulate propagation of electromagnetic and various-type hadron particles through a sandwich-like medium of emulsion chambers as well as measuring procedures employed for...
Prof.
Rauf Mukhamedshin
(Institute for Nuclear Research of Russian Academy of Science)
29/06/2010, 16:30
Balloon and satellite experiments
Poster
New-type coordinate detector is considered which is based on special-purpose integrated circuit designed for detection of charged particles, local amplification and direct transmission of signal into computer. It is shown that such detectors make it possible to achieve a higher coordinate determination accuracy and processing speed as well as to bring down their cost as compared with modern...
Prof.
Rauf Mukhamedshin for ATHLET Collaboration
(Institute for Nuclear Research of Russian Academy of Science)
29/06/2010, 16:30
Extensive air shower experiments
Poster
Three-level (3340, 1750 and 850 m a.s.l) ATHLET (Almaty Three Level Experimental Technique) complex is built up for investigations in fields of cosmic ray (CR) physics, astrophysics and gamma-ray astronomy of superhigh energies. The ATHLET’s highest part has to include a) 1-km2-area ADRON-M facility with a “dense” location of detectors to detect electromagnetic, hadron, muon, neutron and radio...
Mr
Ashwini Kumar
(Banaras Hindu University)
29/06/2010, 16:30
Emulsion chambers
Poster
We present our observations on the various features from the 855 interactions of 14.6 A
GeV 28Si in nuclear emulsion. Multiplicity distribution, mean multiplicities, multiplicity
correlations of black, grey, shower and helium fragments are studied in this investigation. A
comparative study of the results obtained from the interactions at 14.6 A GeV ...
Prof.
Edgar Bugaev
(Institute for Nuclear Research)
29/06/2010, 16:30
Muons
Poster
We present results of caslculations of transverse and longitudinal cross sections of photoabsorption on the nucleon target, in a broad region of very small Bjorken x values and not very large photon virtualities, using the two-component model developed by authors in their previous works. The model is based on the generalized vector dominance concept and color dipole approaches. The detailed...
Ms
Laura Watson
(Imperial College London)
29/06/2010, 16:30
Anisotropy
Poster
Active galactic nuclei (AGNs) appear to be the most plausible source of ultra-high energy cosmic rays (UHECRs), yet there is currently no conclusive evidence for this hypothesis. Correlation between the arrival directions of some UHECRs and the positions of nearby AGNs has been reported for a sample of 27 UHECRs detected by the Pierre Auger Observatory (PAO 2007), although analyses of larger...
Mr
Benjamin Burch
(Washington University in St. Louis)
29/06/2010, 16:30
Balloon and satellite experiments
Poster
The positron fraction observed by PAMELA and other experiments up to ~100 GeV is analyzed in terms of models of cosmic-ray propagation. It is shown that generically we expect the positron fraction to reach ~0.6 at energies of several TeV, and its energy dependence bears an intimate but subtle connection with that of the boron to carbon ratio in cosmic rays. The observed positron fraction can...
Dr
AKINORI OHSAWA
(Institute for Cosmic Ray Research, University of Tokyo.)
29/06/2010, 16:30
Accelerator data
Poster
In our previous presentation we showed how well the rapidity density distributions and the transverse momentum (p_{T}) distributions at sqrt{s}=22.4, 546 and 1800 GeV are described by our phenomenological formulation.
Based on the energy dependence of the values of the parameters, which are obtained by fitting the calculated distributions to those of the experiments, we examine how the...
Dr
Marek Szuba
(Karlsruhe Institute of Technology)
29/06/2010, 16:30
Accelerator data
Poster
An important approach to studying high-energy cosmic rays is the investigation of the properties of extensive air showers; however, the lateral distribution of particles in simulations of such showers strongly depends on the applied model of low-energy hadronic interactions. It has been shown that many constraints to be applied to these models can be obtained by studying identified-particle...
Dr
Aleksei A. Mikhailov
(Yu.G. Shafer Institute of Cosmophysical Research and Aeronomy)
29/06/2010, 16:30
Extensive air shower experiments
Poster
The arrival directions of ultrahigh energy extensive air
showers (EAS) by Yakutsk, AGASA and P. Auger data are considered. For
the first time, the arrival directions of extensive air showers of
ultrahigh energy, registered by Yakutsk EAS array more carefully are
considered. It is found that the arrival directions of EAS Yakutsk
data are correlated with pulsars from side Input of...
Mr
Mohammed Hasan Soleiman Yussef
(Cairo University, Faculty of Science, Physics department.)
29/06/2010, 16:30
Balloon and satellite experiments
Poster
In the present study, we inspecte a refined sample of 117 bursts from SGR1900+14 observed with RXTE, PCA. We use 10 spectral-models, and the best fitting spectral-models has been found statistically to be the thermal bremsstrahlung and the power-law. Data are analyzed more by model-independent techniques. The global color-color diagrams are obtained with no distinguishable patterns as other...
Prof.
Sayed Saleh
(Cairo University)
29/06/2010, 16:30
Accelerator data
Poster
Analysis has been done for the emitted particles in (12C, 16O, 22Ne, 28Si) + Emulsion interactions at (4.1-4.5) A GeV/c. The multiplicity of the emitted particles; as a function of the mass-number of the interacting projectiles nuclei; has been calculated. The multiplicity distribution and the average-values of the emitted particles (the experimental-values) are compared with that calculated...
Prof.
Rauf Mukhamedshin
(Institute for Nuclear Research of Russian Academy of Science)
29/06/2010, 16:30
Balloon and satellite experiments
Poster
Mathematical model of experimental conditions on research for primary cosmic radiation (PCR) on the lunar surface and circumlunar orbit is considered. The fundamental possibility of detection of PCR particles is shown by the use of simultaneous detection of three components produced by cascades in the lunar regolith (secondary neutrons, gamma-ray and radio emission) measured by detectors...
Prof.
Vera Georgievna Sinitsyna
(P.N. Lebedev Physical Institute)
29/06/2010, 16:30
Anisotropy
Poster
Galaxy clusters have been consider as sources of TeV gamma-rays emitted by high-energy protons and electrons accelerated by large scale structure formation shocks, galactic winds, or active galactic nuclei. The Perseus cluster of galaxies is one of the best studied clusters due to its proximity and its brightness. Galaxy NGC 1275 is the central dominant galaxy of the Perseus Cluster of...
Dr
Iliana Brancus
(National Institute for Physics and Nuclear Engineering Horia Hulubei)
29/06/2010, 16:30
Muons
Poster
The WILLI detector, built in IFIN-HH Bucharest, in collaboration with KIT Karlsruhe, is a rotatable modular detector for measuring charge ratio for cosmic muons with energy < 1 GeV. It is under construction a mini-array for measuring the muon charge ratio in Extensive Air Showers. The EAS simulations have been performed with
CORSIKA code.
The values of the muon flux, calculated with...
Mr
Douglas Rodriguez
(University of Utah)
29/06/2010, 16:30
Experiments above the Ankle
Poster
The Telescope Array's Middle Drum fluorescence detector was constructed using refurbished telescopes from the High Resolution Fly's Eye (HiRes) experiment. As such, there is a direct comparison between these two experiments' fluorescence energy spectra. A progress report will be presented based on over 2 years of collected data by the Middle Drum site of Telescope Array.
Dr
Ely Leon
(Chicago State University)
29/06/2010, 16:30
Muons
Poster
I present the prototype Threshold Cerenkov Detector with Radial Segmentation; as a part of the detector development and implementation research. The detector has three concentric cylinders, each with a different dielectric medium, and four scintillators that triggers cosmic particles with a time of fly of 5 ns. The radiator is designed to produce more photons as the particles travels into the...
Dr
Venktesh SINGH
(Banaras Hindu University, Varanas 221 005, INDIA)
29/06/2010, 16:30
Emulsion chambers
Poster
The emission of projectile fragments alpha has been studied in 84Kr interactions with nuclei of the nuclear emulsion detector composition at relativistic energy below 2 GeV per nucleon. The angular distribution of projectile fragments alpha in terms of transverse momentum could not be explained by a straight and clean-cut collision geometry hypothesis of Participant – Spectator (PS) Model....
Dr
Nobusuke Takahashi
(Hirosaki University)
29/06/2010, 16:30
Muons
Poster
We calculate high and ultra-high energy upward-going muon neutrino propagation through the Earth and the induced muon energy distribution near the one cubic kilometer detector using the Monte Carlo simulation, according to neutral current interaction. The primary neutrino energies on the surface of the Earth are 1PeV, 1EeV, and 1ZeV.
The mean free paths of ultra-high energy neutrino events...