12-20 July 2017
Asia/Seoul timezone
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CR-I(Cosmic ray-Indirect)


Location: BEXCO
Date: from 13 Jul 13:30 to 20 Jul 09:45


  • 20 Jul 09:00 - 09:45
    • Capriori, Damiano

Timetable | Contribution List

Displaying 112 contributions out of 112
on 20/7/2017 at 0:00
In more and more applications, semi-conductor photo sensors (SiPMs) are replacing classical photo multiplier tubes (PMT). They have the advantage of an easier handling due to their significantly lower bias voltage and a long life time without ageing. Due to their smaller size compared to PMTs, usually detectors need an adapted design for the application of SiPMs. While the linear dynamic range of ... More
Presented by Thomas BRETZ on 15/7/2017 at 7:45
Young shell-type supernova remnants (SNRs) are believed to be a source of Galactic cosmic rays (CRs) with energies up to a few PeV. These particles are assumed to be energized via diffusive shock acceleration (DSA) in collisionless shock waves. Effective DSA process requires turbulent magnetic fields amplified to levels much higher than typically found in the interstellar medium. Such fields can b ... More
Presented by Oleh KOBZAR on 14/7/2017 at 8:00
Experimental complex (EC) NEVOD includes a number of unique experimental facilities for studies of main components of cosmic rays on the Earth's surface: a large volume Cherenkov water calorimeter (CWC) (2000 m^3) with a spatial lattice of quasi-spherical modules (QSM); a vertically deployed around CWC coordinate-tracking detector DECOR (total setup area 70 m^2) with a high spatial and angular res ... More
Presented by Igor YASHIN on 18/7/2017 at 8:15
The origin and composition of ultra-high-energy cosmic rays (UHECRs) remain a mystery. The proton dip-model describes the shape of the cosmic ray spectrum above 10^9 GeV by the effect of a pure proton spectrum propagating through the cosmic microwave background. In these interactions secondary neutrinos are produced. We fit the recent UHECR spectrum measurements from the Telescope Array experiment ... More
Presented by Jonas HEINZE on 19/7/2017 at 4:45
The shock formation, their electromagnetic structure, and the injection of suprathermal particles into the first-order Fermi acceleration processes at collisionless shocks constitute important problems of high-energy astrophysics. We report on recent studies of high Mach-number nonrelativistic perpendicular shocks with fully kinetic two-dimensional particle-in-cell simulations in applications to f ... More
Presented by Jacek NIEMIEC on 18/7/2017 at 5:00
Electron injection constitutes a central unresolved problem for diffusive shock acceleration processes. Here we study perpendicular nonrelativistic collisionless shocks in a regime of high Mach numbers, as appropriate for young supernova remnants. We use high-resolution large-scale two-dimensional fully kinetic particle-in-cell simulations that sample a representative portion of the turbulent shoc ... More
Presented by Artem BOHDAN on 18/7/2017 at 4:45
In this paper we present our estimation of the cosmic rays mass composition at energies over 10^17 eV. It was obtained from the analysis of the lateral distribution of cascade particles in extensive air showers registered at the Yakutsk EAS array over the course of continuous observations from 1974 to 2017. Experimental values were compared to simulation results obtained within the framework of fo ... More
Presented by Artem SABOUROV on 19/7/2017 at 7:45
The Fluorescence detector Array of Single-pixel Telescopes (FAST) is a design concept for the next generation of ultrahigh-energy cosmic ray (UHECR) observatories, addressing the requirements for a large-area, low-cost detector suitable for measuring the properties of the highest energy cosmic rays. In the FAST design, a large field of view is covered by a few pixels at the focal plane of a mirror ... More
Presented by Toshihiro FUJII on 17/7/2017 at 4:30
We develop a simple one-zone model of the steady-state Crab nebula spectrum encompassing both the radio/soft X-ray and the GeV/multi-TeV observations. We determine analytically the photon differential energy spectrum as originated by an electron distribution evolved from a log-parabola injection spectrum. We find an impressive agreement with the synchrotron region observations whereas synchrotron ... More
Presented by Martin POHL on 14/7/2017 at 8:30
Non-linear diffusive shock acceleration (NDSA) is believed to be the mechanism responsible for the acceleration of cosmic-rays in supernova remnants. But current steady-state models fail to reproduce spectral features observed in supernova remnants, like spectral breaks or soft spectra at the highest energies. We present a fully time-dependent NDSA-model in which we simultaneously solve the transp ... More
Presented by Robert BROSE on 14/7/2017 at 7:45
A fundamentally new tool for studying the Cherenkov light emission from EAS based on a slit camera, a Cherenkov differential detector (CDD), was created on the Yakutsk complex EAS array. Several these detectors were placed around the center of the array. Arranged in such a way, they operate as a part of a the main array and their data can be used for reconstruction of air shower arrival direction ... More
Presented by Yuriy EGOROV on 14/7/2017 at 5:30
Cosmic rays in the inner solar system are subject to deflection by both the geomagnetic and interplanetary B-fields, and simultaneously interact with the Sun's photosphere resulting in the production of gamma rays. This phenomenon can be studied by observing the deficit ("shadow") in the cosmic ray flux from the direction of the sun and searching for an excess photon signal above the isotropic bac ... More
Presented by Mehr NISA on 13/7/2017 at 9:00
Tunka-Rex is a 3 km² large antenna array for cosmic-ray air showers at the TAIGA facility (Tunka Advanced Instrument for cosmic ray physics and Gamma Astronomy) in Siberia close to Lake Baikal. In autumn 2016 Tunka-Rex has been extended to a total of 63 stations, each equipped with SALLA antennas for two polarization directions operating in the band of 30-80 MHz. All antenna stations are triggere ... More
Presented by Frank SCHRÖDER on 15/7/2017 at 8:00
Inelastic nucleus-nucleus (N-N) cross section is one of the most important physical parameters of an Extensive Air Shower (EAS) development. Value of this parameter was measured in past with relatively big uncertainty by few ground-based cosmic ray experiments up to 95 TeV in c.m.s. For simulation of EAS development at Ultra High Energy Cosmic Rays (UHECR) it is necessary to extrapolate N-N cross- ... More
Presented by Zbigniew PLEBANIAK on 18/7/2017 at 5:15
Vela Jr. (RX J0852.0-4622) is one of just a few known supernova remnants (SNRs) with the resolved shell across the whole electromagnetic spectrum from radio to very-high-energy (>100 GeV; VHE) gamma-rays. Its proximity and large size allow for detailed spatially resolved observations of the source making Vela Jr. one of the primary sources used for the study of particle acceleration and emission m ... More
Presented by Iurii SUSHCH on 19/7/2017 at 5:30
We report an updated diffuse photon flux limits based on the analysis of the Telescope Array surface detector events for the primary energies greater than 1 EeV. The point source flux limits are also presented for all directions in the Northern hemisphere. We report the results of down-going neutrino search.
Presented by Grigory RUBTSOV on 18/7/2017 at 5:30
Measurement of individual cosmic rays species in a broad energy range from 50TeV to sub-EeV is one of main goals of LHAASO experiment. In order to cover the broad energyrange, the observations are divided into three stages, which are from 50 TeV to 10 PeV, from 10PeV to 100 PeV, from 100 PeV to EeV. In this paper, we present a preliminary investigation on the capability of particle identification, ... More
Presented by Lingling MA on 19/7/2017 at 4:45
The Large High Altitude Air Shower Observatory (LHAASO) is a multipurpose project focusing on high energy gamma ray astronomy and cosmic ray physics. The 1 km2 array (KM2A) of this observatory will consist of 5242 electromagnetic particle detectors (EDs) and 1171 muon detectors (MDs). The remoteness and numerous EDs extremely demand a robust and automatic calibration procedure. In this paper, a se ... More
Presented by Hongkui LV on 15/7/2017 at 4:45
The Telescope Array has accumulated the largest UHECR data set in the Northern hemisphere. We make use of these data to search for large- and small-scale anisotropy of UHECR arrival directions. At small angular scales, we report an update on searches for clustering of events and on correlations with various classes of putative sources. At large angular scales, we revisit, with the new data and wit ... More
Presented by Sergey TROITSKY on 19/7/2017 at 4:30
KASCADE and KASCADE-Grande were detector arrays for the measurement of extensive air showers generated by high-energy cosmic rays in the PeV to EeV energy range. KASCADE-Grande has been operated for more than two decades and completed the data taking at the end of 2013. Now, a new analysis of the combined data from both arrays of KASCADE and KASCADE-Grande was performed, increasing both the effect ... More
Presented by Donghwa KANG on 13/7/2017 at 8:15
EUSO-Balloon was launched by the French Space Agency CNES from the Timmins base in Ontario (Canada) on the moonless night of August 25, 2014 UT. After reaching the floating altitude of about 38 km, EUSO-Balloon imaged the UV intensity in the wavelength range 290 - 430 nm for more than 5 hours before descending to ground using the key technologies of JEM-EUSO. A detailed and precise measurement of ... More
Presented by Mario BERTAINA on 15/7/2017 at 4:30
The KASCADE-Grande experiment has significantly contributed to the current knowledge about the energy spectrum and composition of cosmic rays for energies between the knee and the ankle. Meanwhile, post-LHC versions of the hadronic interaction models are available and used to interpret the entire data set of KASCADE-Grande. In addition, a new, combined analysis of both arrays, KASCADE and Grande, ... More
Presented by Andreas HAUNGS on 19/7/2017 at 8:30
LHAASO (Large High Altitude Air Shower Observatory) will be constructed at 4400 m asl in Daocheng, Sichuan province, aiming to discover sources of UHE (ultra-high energy) cosmic ray and study of cosmic ray physics. The whole array includes 1171 muon detectors (MDs, about 40000 Square meters), which would be the largest muon detector array in the world. The special high altitude and wild field envi ... More
Presented by Xiong ZUO on 17/7/2017 at 4:45
We calculate the large-scale cosmic-ray (CR) anisotropies predicted for a range of Goldreich-Sridhar (GS) and isotropic models of interstellar turbulence, and compare them with IceTop data. In general, the predicted CR anisotropy is not a pure dipole; the cold spots reported at 400 TeV and 2 PeV are consistent with a GS model that contains a smooth deficit of parallel-propagating waves and a broad ... More
Presented by Gwenael GIACINTI on 14/7/2017 at 7:30
Mini-EUSO (Extreme Universe Space Observatory) is a space mission developed by the JEM-EUSO International Collaboration, approved and selected by the Italian Space Agency (ASI) and, under the name “UV atmosphere”, by the Russian Space Agency Roscosmos, to be carried to the International Space Station (ISS) in one of the next planned launches. The Mini-EUSO instrument is a small, compact telesc ... More
Presented by Marco RICCI on 19/7/2017 at 9:15
The Telescope Array Low-energy Extension (TALE) experiment is a hybrid air shower detector for observation of air showers produced by very high energy cosmic rays above 10^16.5 eV. TALE is located at the Telescope Array (TA) experiment site in the western desert of Utah, USA. TALE has a surface detector (SD) array made up of 103 scintillation counters (40 with 400 m spacing, 36 with 600 m spacing ... More
Presented by shigeharu UDO on 15/7/2017 at 5:45
We report results on ultra-high energy cosmic rays' chemical composition based on the data from the Telescope Array surface detector facility. The Telescope Array (TA) is an experiment designed for observation of extensive air showers from high energy cosmic rays, located in Utah, USA. TA surface detector (SD) array consists of 507 detector units, placed in a square grid with 1.2 km spacing with t ... More
Presented by Yana ZHEZHER on 17/7/2017 at 8:45
The Probe Of Extreme Multi-Messenger Astrophysics (POEMMA) mission is design to establish charged particle astronomy with ultra-high energy cosmic rays (UHECRs) and to discover cosmogenic tau neutrinos (CTNs). The study of UHECRs and CTNs from space will yield orders-of-magnitude increase in statistics of observed UHECRs and the discovery of the cosmogenic flux of neutrinos for the full predicted ... More
Presented by Angela V OLINTO on 18/7/2017 at 9:15
In the Large High Altitude Air Shower Observatory project, Muon detectors will be built at 4400m above sea level. As water cerenkov detector, 44 tons of ultrapure water should be infused into the Muon detector. In this cold area, once the water inside the Muon detector freezes, consequence would be very serious. In this paper, a simulation of water temperature is built, the simulation data are con ... More
Presented by Shaohui FENG on 15/7/2017 at 5:15
The Large High Altitude Air Shower Observatory (LHAASO) will be constructed at Mountain Haizishan, in Sichuan Province, China (4410m a.s.l.). The Water Cherenkov Detector Array (WCDA), one of the major component of the LHAASO, will focus on surveying the northern sky for gamma ray sources from 100 GeV to 30 TeV. The whole WCDA, owing an area of 78,000 m2, is subdividing into 3120 detector cells (5 ... More
Presented by Cheng LIU on 18/7/2017 at 8:30
The paper presents results obtained from radio emission measurements at frequency 30-35 MHz from air shower particles with energy E≥1019 eV. The data obtained at the Yakutsk array, for 1986-1989 and 2009-2014 years. The generalized formula for the description of the lateral distribution of radio emission was derived with use of fundamental characteristics of air showers: energy E0 and air shower ... More
Presented by Igor PETROV on 13/7/2017 at 8:45
We are developing a wide field-of-view Cherenkov telescope with large dimensional refractive lens for sub-100GeV to TeV gamma ray astronomy. A prototype of the refractive telescope with the front-end electronics is designed, assembled, and tested to demonstrate the feasibility of the conceived instrument. In this work, we report some preliminary results on the detection of high energy Cosmic Rays ... More
Presented by Tianlu CHEN on 17/7/2017 at 5:00
Over the years, significant efforts have been devoted to the understanding of the radio emission of extensive air shower (EAS) in the range [20-250] MHz. Despite some studies led until the eighties, the [1-10] MHz band has remained unused for 20 years. However, it has been measured by these pioneering experiments and suggested by theoretical calculations that EAS emit a strong electric field in th ... More
Presented by Antony ESCUDIE on 18/7/2017 at 7:45
During the past two decades, experiments in both the northern and southern hemispheres have observed a small but measurable energy-dependent sidereal anisotropy in the arrival direction distribution of Galactic cosmic rays with relative intensities at the level of one per mille. Individually, these measurements are restricted by limited sky coverage, and so the pseudo-power spectrum of the anisotr ... More
Presented by Juan Carlos DIAZ-VELEZ on 19/7/2017 at 5:15
The Telescope Array Low-energy Extension (TALE) experiment is a hybrid air shower detector for observation of air showers produced by very high energy cosmic rays above 10^16.5 eV. TALE is located at the Telescope Array (TA) experiment site in the western desert of Utah, USA. TALE has a surface detector (SD) array made up of 103 scintillation counters (40 with 400 m spacing, 36 with 600 m spacing ... More
Presented by Douglas BERGMAN on 17/7/2017 at 8:30
The radio signals produced by extensive air showers initiated in the atmosphere by high energy cosmic rays are routinely observed and registered by the various instruments of the CODALEMA experiment located at the Nançay radio observatory and notably the large array of self-triggering stations equipped with wide band and dual polarisation antennas. Precise comparisons between observed radio signa ... More
Presented by Lilian MARTIN on 18/7/2017 at 7:30
The measurement of the electric field created by cosmic ray induced air showers is nowadays a well established technique. Due to technical limitations, the low-end part of the frequency spectrum of the field has not been thoroughly exploited or understood, even though some experiments have indicated a large electric field at low frequencies. In this work, we present a new equation for the electric ... More
Presented by Daniel GARCÍA-FERNÁNDEZ on 18/7/2017 at 5:30
Galactic cosmic rays are believed to be accelerated at supernova remnant shocks. We model the dynamical evolution of type I and type II supernova remnants, and discuss how the maximum energy of accelerated protons and electrons is expected to evolve in time. In particular, we discuss whether supernova remnants can accelerate protons all the way up to PeV energies, and the crucial role of of magnet ... More
Presented by Daniele GAGGERO on 14/7/2017 at 8:45
The approach to cosmic ray (CR) study with reflected optical Vavilov-Cherenkov radiation (“Cherenkov light”) was proposed long ago. At present the SPHERE-2 detector is the only existing apparatus that have detected a significant sample of extensive air showers (EAS) by means of this method. At the same time the recorded data allows detailed reconstruction of EAS lateral distribution function ( ... More
Presented by Dmitry PODGRUDKOV on 19/7/2017 at 5:00
Ultra high energy cosmic ray chemical composition is important to resolving questions about the locations of UHECR sources and propagation models. Because composition can only be deduced by a process of statistical inference via the observation of air shower maxima ($X_{ m max}$), UHECR observatories with large data collection rates must be employed to reduce statistical fluctuations. Telescope Ar ... More
Presented by William HANLON on 18/7/2017 at 8:00
The LOw Frequency ARay (LOFAR) is a multipurpose radio antenna array aimed to detect radio signals in the frequency range 10-240 MHz, covering a large surface in Northern Europe with a higher density in the Netherlands. The high number density of radio antennas at the LOFAR core in Northern Netherlands allows to detect radio signals emitted by cosmic-ray induced air showers in the energy range 10^ ... More
Presented by Laura ROSSETTO on 13/7/2017 at 8:00
The Telescope Array (TA) is a hybrid cosmic ray detector using air fluorescence detectors (FDs) and an array of surface detectors (SDs) which covers 700km^2 in Utah. The TA Low-energy Extension (TALE) also consists of FDs with larger elevation angles and an infill SD array with 400m spacing, which extends the observable energy range down to 4 PeV. In this talk we will present the spectrum from the ... More
Presented by Yoshiki TSUNESADA on 19/7/2017 at 7:30
We report on a cosmic ray energy spectrum measurement by the Telescope Array Low-Energy extension (TALE) air fluorescence detector {FD). This spectrum exhibits two features, the second knee in the lower part of the 10^17 eV decade, and a hardening in the lower part of the 10^16 eV decade. The energies of these features, for the first time, are tied to the energy scale of fluorescence detectors of ... More
Presented by Tareq ABUZAYYAD on 19/7/2017 at 5:45
KLYPVE-EUSO is a mission led by the Russian Space Agency to place an ultra-high energy cosmic ray observatory on board the Russian Segment (RS) of the ISS. The concept of the detector is based on the mirror-type detector proposed by SINP MSU in 2010 and improved by the joint studies with the JEM-EUSO collaboration. The current configuration is based on a Schmidt type optical system. This allows to ... More
Presented by Pavel KLIMOV on 15/7/2017 at 8:45
The standard analytical model for gamma-ray burst (GRB) afterglows is that they are produced by power-law electron distributions emitting synchrotron, and synchrotron self-Compton, radiation. These electrons, in turn, are produced by highly relativistic shocks sweeping up low-magnetization plasma from the circumburst environment. In this scenario, plasma instabilities develop upstream from the sho ... More
Presented by Donald WARREN
The standard analytical model for gamma-ray burst (GRB) afterglows is that they are produced by power-law electron distributions emitting synchrotron, and synchrotron self-Compton, radiation. These electrons, in turn, are produced by highly relativistic shocks sweeping up low-magnetization plasma from the circumburst environment. In this scenario, plasma instabilities develop upstream from the sho ... More
Presented by Donald WARREN on 18/7/2017 at 5:45
We present a new parametrisation of the cosmic-ray flux and its mass composition over an energy range from 10 GeV to 10^11 GeV. Our approach is data-driven and relies on theoretical assumptions as little as possible. We combine measurements of the flux of individual elements from high-precision satellites and balloon experiments with indirect measurements of mass groups from the leading air shower ... More
Presented by Hans DEMBINSKI on 19/7/2017 at 5:45
In order to model the magnetic field amplification and particle acceleration that takes place in astrophysical shocks, we need a code that can efficiently model the large-scale structure of the shock, while still taking the kinetic aspect of non-thermal particles into account. Starting from the proven MPI-AMRVAC magnetohydrodynamics code we have created a code that combines the kinetic treatment o ... More
Presented by Allard Jan VAN MARLE on 14/7/2017 at 8:15
The spatial signal distribution of the radio frequency radiation from extensive air showers on the ground contains information of crucial cosmic-ray properties, such as energy and mass. A long standing challenge to access this information experimentally with a sparse grid of antennas is an analytic modeling of the radio signal distribution, which will be addressed in this contribution. We present ... More
Presented by Christian GLASER on 17/7/2017 at 5:30
Coherent radio signals in the MHz range are emitted from extensive air showers initiated by high-energy cosmic rays. Observing this emission enables precise measurement of the energy of the primary particle. Compared with those made with the well-established fluorescence technique, radio measurements are less dependent on atmospheric conditions, and thus offer the potential of energy determination ... More
Presented by Raphael KRAUSE on 13/7/2017 at 5:45
The ARIANNA experiment is designed to measure the radio emission created by neutrinos (> 10^16 eV) interacting in the Antarctic ice. The detection is achieved by installing high gain log-periodic dipole antennas just below the surface, which record the radio pulses. The current design foresees more than 1000 independent radio detection stations with a spacing of at least one kilometer. The ARIANNA ... More
Presented by Anna NELLES
Sound knowledge of the aerosol loading in the atmosphere above the Pierre Auger Observatory is essential for the accurate reconstruction of shower energy deposit profiles using the atmospheric fluorescence technique. The vertical aerosol optical depth is inferred via two complementary techniques from hourly measurements of the vertically-fired UV laser beam of the Observatory’s central laser fac ... More
Presented by Max MALACARI on 15/7/2017 at 9:00
We report an anisotropy in the flux of cosmic rays with energies above 8 EeV observed using data recorded at the Pierre Auger Observatory with more than 12 yr of operation. We consider events with zenith angles up to 80°, so that 85% of the sky is observed, and for energies in excess of 4 EeV, for which the Observatory is fully efficient. An analysis of the first harmonic in right ascension is pe ... More
Presented by Oscar Alejandro TABORDA PULGARIN on 17/7/2017 at 7:30
The Auger-TA composition working group will report on a comparison of Xmax distributions measured by the Pierre Auger and Telescope Array Observatories. We will evaluate whether the shapes of the Auger and TA Xmax distributions are statistically compatible and whether the distribution modes are within the quoted systematic uncertainties. A direct comparison of the measured Xmax distributions is no ... More
Presented by Vitor DE SOUZA on 18/7/2017 at 5:45
We present a new method of searching for origins of ultra‐high energy cosmic rays directly from observed data. We include corrections for deflections in the galactic magnetic field according to the individual cosmic ray charges. The analysis procedure is iterative and consists of the following steps. Initially, we assign to each cosmic ray a charge hypothesis and apply corresponding corrections ... More
Presented by Martin URBAN on 18/7/2017 at 4:30
We report on radio frequency measurements of the electron beam sudden appearance signal from the Telescope Array Electron Light Source (TA-ELS). The TA-ELS is constructed to calibrate the Telescope Array fluorescence telescope, and as such it can be used to mimic a cosmic-ray or neutrino induced particle cascade. This makes the TA-ELS the perfect facility to study new detection techniques such as ... More
Presented by Krijn D. DE VRIES on 18/7/2017 at 8:00
Two hybrid analyses using air shower events recorded by both the Surface Detector Array (SD) and the Fluorescence Detector (FD) of the Pierre Auger Observatory are presented. In the first analysis, a search for a diffuse flux of photons with energies above 10^18 eV = 1 EeV is performed. An unprecedented separation power between photon and hadron primaries is achieved through combining observables ... More
Presented by Marcus NIECHCIOL on 18/7/2017 at 7:30
The GeV-TeV gamma-rays and the PeV-EeV neutrino backgrounds provide a unique window on the nature of the ultra-high-energy cosmic-ray (UHECR). We discuss the implications of the recent Fermi-LAT data regarding the extragalactic gamma-ray background (EGB) and related estimates of the contribution of point sources as well as IceCube neutrino data on the origin of the ultra-high-energy cosmic-ray (UH ... More
Presented by Noemie GLOBUS on 18/7/2017 at 4:45
As the flux of ultra-high-energy cosmic-rays (UHECR) is very low, detectors with a large effective area and high duty cycle are needed. Radio detection of extensive air showers (EAS) presents attractive aspects for future experiments, with very low cost per detector unit, easiness of deployment over large areas and close to 100% duty cycle. More research and development on radio detection is ongoi ... More
Presented by Quanbu GOU on 14/7/2017 at 5:15
Evidence of an energy dependent intermediate-scale anisotropy has been found in the arrival directions of ultra-high energy cosmic rays in the northern hemisphere, using 7 years of TA surface detector data. The previously reported “hot spot" excess E ≥ 10^19.75 EeV is found to correspond to a deficit, or “cold spot," of events for 10^19.2 ≤ E < 10^19.75 EeV. This feature suggests energy de ... More
Presented by Jon Paul LUNDQUIST on 18/7/2017 at 9:00
The HAWC (High Altitude Water Cherenkov) gamma ray observatory can detect muons with nearly horizontal trajectories. HAWC is located at an altitude of 4100 meters a.s.l. on Sierra Negra in Mexico, and is composed of 300 water tanks, each 7.3 m in diameter and 4.5 m deep, densely packed over a physical area of approximately 22,000 m2. Previous and current experiments have observed high zenith angle ... More
Presented by Wayne SPRINGER on 17/7/2017 at 8:00
The Telescope Array (TA) experiment consists of a surface detector (SD) array covering 700 km^2 in area and three fluorescence detector (FD) stations, and explores the origin of ultra-high-energy cosmic rays. We found evidence for a hotspot in the arrival directions of cosmic rays with energies above 57 EeV (Abbasi et al. 2014). New SDs and FDs are planned to be constructed for the TAx4 experiment ... More
Presented by Eiji KIDO on 15/7/2017 at 9:15
The surface detector array of the Pierre Auger Observatory measures the arrival time distribution of particles and therefore provides indirect information on the longitudinal development of the muonic component of extensive air showers. In this work, the depth at which the muon production is maximum and, for the first time, the corresponding shower-to-shower fluctuations, are reconstructed for mor ... More
Presented by Manuela MALLAMACI on 18/7/2017 at 8:45
The Pierre Auger Observatory has collected the largest exposure of ultra-high energy cosmic rays over the past decade, providing an unprecedented data set of high quality. The analysis of these data has led to major breakthroughs in the understanding of the origin and properties of the highest-energy cosmic rays, but a coherent interpretation has not yet been achieved. New questions have emerged, ... More
Presented by Daniele MARTELLO on 15/7/2017 at 7:30
We present shower depth of maximum (Xmax) distributions and their interpretation in terms of the cosmic ray mass composition. The measurements of Xmax are based on data from the fluorescence telescopes of the Pierre Auger Observatory. Due to the extension of the field of view with the High Elevation Auger Telescopes, a lower energy threshold of 10^17.2 eV can be reached. At the highest energies we ... More
Presented by Jose BELLIDO on 18/7/2017 at 8:15
We present simulations of the propagation of ultra-high energy cosmic rays (UHECR) in three-dimensional space, including realistic assumptions about the extragalactic magnetic field (EGMF) and taking into account the cosmological evolution of the universe as well as interactions of the UHECR with the extragalactic background light (EBL). On this basis, we study which energy spectrum and chemical c ... More
Presented by David WITTKOWSKI on 19/7/2017 at 5:00
The H.E.S.S. experiment has collected data for more than 10 years. Despite its design for gamma-ray astronomy, H.E.S.S. already demonstrated in the past its ability to measure the cosmic-ray electron spectrum above a few hundred GeV. Since this first measurement, new observations have increased the amount of available data for such an analysis by more than a factor of four. Furthermore, with a new ... More
Presented by Daniel KERSZBERG on 19/7/2017 at 5:30
We present a description of the new Tien-Shan complex installation for investigation of various fundamental and applied problems in different fields of the astroparticle, atmospheric and environmental physics. The principal design of the detector complex is based on simultaneous registration of electromagnetic, muonic and hadron components of the cosmic ray showers. We discuss all the settings for ... More
Presented by Vladimir RYABOV on 18/7/2017 at 9:15
A number of cosmic-ray air shower experiments have determined the anisotropy in the TeV to PeV energy range. The large-scale anisotropy pattern is not a dipole as expected from the standard theory of cosmic-ray transport in interstellar magnetic fields. Rather, it is severely distorted and breaks into smaller structures. This is due to the presence of the heliosphere. To fully understand the cosmi ... More
Presented by Ming ZHANG on 17/7/2017 at 5:45
The High Altitude Water Cherenkov (HAWC) observatory is a ground-based air-shower detector designed to study the TeV gamma and cosmic ray windows. The observatory is composed of a densely packed array of 300 water Cherenkov tanks, 4.5 m deep and 7.3 diameter with 4 photomultipliers (PMT) each, distributed on a 22,000 m2 surface. The instrument registers the number of hit PMT’s as well as the tim ... More
Presented by Juan Carlos ARTEAGA-VELÁZQUEZ on 19/7/2017 at 8:15
The elemental energy spectra of cosmic rays play an important role in understanding their acceleration and propagation. Most current results are obtained either from direct measurements by balloon- or satellite-borne detectors, or from indirect measurements by air shower detector arrays on the Earth's surface. Imaging Air Cherenkov Telescopes (IACTs), used primarily for gamma-ray astronomy, can al ... More
Presented by Henrike FLEISCHHACK on 17/7/2017 at 9:00
The LOFAR radio telescope measures the radio emission from extended air showers with unprecedented precision. In the dense core individual air showers are detected by hundreds of dipole antennas. By fitting the complicated radiation pattern to Monte Carlo radio simulation codes we obtain measurements of Xmax with a precision of <20 g/cm^2. We present the latest LOFAR results of cosmic-ray mass com ... More
Presented by Stijn BUITINK on 19/7/2017 at 8:45
NA61/SHINE is a fixed target experiment designed to study hadron-proton, hadron-nucleus and nucleus-nucleus interactions at the CERN Super-Proton-Synchrotron. We will present results on spectra of identified hadrons produced in pion-carbon production interactions, which are of fundamental importance to improve the extensive air shower modeling, and hence the interpretation of ultra-high-energy-cos ... More
Presented by Raul Ribeiro PRADO on 13/7/2017 at 7:30
The Telescope Array and Pierre Auger Collaborations have formed a working group to examine the similarities and differences in their measurements of the spectrum of ultra-high energy cosmic rays. The method chosen is for each experiment to measure the spectrum in the declination band of -15.7 < delta < +24.8 degrees, where both experiments have sensitivity. A second step chosen is to correct for t ... More
Presented by Dmitri IVANOV on 18/7/2017 at 7:45
EUSO-TA is an on-ground telescope, located at the Telescope Array (TA) site in Black Rock Mesa, Utah, USA. The main aim of the instrument is the observation of Ultra-High Energy Cosmic Rays through detection of ultraviolet light generated by cosmic-ray air showers. EUSO-TA consists of two, 1 m2 Fresnel lenses with a field of view of about 11x11 degrees. Light is focused on the Photo Detector Modul ... More
Presented by Lech PIOTROWSKI on 13/7/2017 at 4:30
The time structure of the signals from air showers, recorded with the water-Cherenkov detectors of the Pierre Auger Observatory, contains information that can be related to the mass composition of primary cosmic rays and to hadronic multi-particle production. We can study both because the recorded signals contain a mix of the muonic and electromagnetic components. Using information from the time s ... More
Presented by Patricia SANCHEZ-LUCAS on 18/7/2017 at 8:30
In 2008, a radio signal interpreted as Molecular Bremsstrahlung Radiation (MBR) was detected from electromagnetic showers produced in beam test experiments at SLAC at microwave frequencies. Due to the isotropic nature of MBR and its insensitivity to atmospheric attenuation and light conditions, it would allow the measurement of the shower longitudinal profile with an almost 100% duty cycle compare ... More
Presented by Romain GAIOR on 15/7/2017 at 8:30
The observation of Ultra-high-energy cosmic rays (UHECR) from space offers several advantages such as large exposure, uniform observation of both celestial hemispheres, uniform detector response. The EUSO collaboration is implementing a mission based on the International Space Station, KLYPVE-EUSO, which will observe UHECR from space for the first time. To this purpose, we have developed high-perf ... More
Presented by Marco CASOLINO on 15/7/2017 at 8:15
The Telescope Array (TA) shows a 20◦ hotspot as well as an excess of UHECRs above 50 EeV when compared with the Auger spectrum. We consider the possibility that both the TA excess and hotspot are due to a dominant source in the Northern sky. We carry out detailed simulations of UHECR propagation in both the intergalactic medium and the Galaxy, using different values for the intergalactic magneti ... More
Presented by Etienne PARIZOT on 19/7/2017 at 5:15
Terrestrial Gamma Flashes (TGFs) have been observed in satellite-borne gamma ray detectors for several decades, starting with the BATSE instrument on the Compton Gamma-Ray observatory in 1994. Subsequent observation and simulation efforts have led to a model in which TGFs are produced in relativistic runaway electron avalanches (RREA), during upward negative breakdown at the beginning of intraclou ... More
Presented by John BELZ on 14/7/2017 at 5:00
Knowledge of the mass composition of cosmic rays in the transition region of galactic to extragalactic cosmic rays would allow for the discrimination of different astrophysical models on their origin, acceleration, and propagation. An important observable to separate different mass groups of cosmic rays is the number of muons in extensive air showers. Currently, both the Pierre Auger and the Teles ... More
Presented by Markus ROTH on 13/7/2017 at 9:15
In order to solve the problem of the excess of multi-muon events observed in several cosmic ray experiments at ultra-high energies (so-called ‘muon puzzle’), investigations of the energy characteristics of the muon component of extensive air showers (EAS) are required. A possible approach to such investigations is the measurement of the energy deposit of muon bundles in the detector, which pro ... More
Presented by Rostislav KOKOULIN on 13/7/2017 at 8:30
The measurement of the individual charged particles in an extensive air shower (EAS), at a surface detector array, provides important distinguishing parameters to identify the cosmic primary mass spectrum. These will also contribute to the mapping of the very high energy interactions in the topmost layers of the atmosphere, i.e., beyond the reach of current accelerators, and to probe anomalies bey ... More
Presented by Moon Moon DEVI on 13/7/2017 at 4:45
Primary cosmic ray energy spectrum above 1 PeV has been measured with PRISMA-YBJ being a prototype of PRISMA array at altitude of 4300 m a.s.l. It realized a novel type of EAS recording method measuring hadronic EAS component over the total array area through thermal neutron detection with a specially developed so-called en-detectors sensitive to electron and thermal neutron EAS components. Primar ... More
Presented by Yuri STENKIN on 19/7/2017 at 4:30
We present an update of the cosmic ray energy spectrum measured from 3*10^17 eV up to the most extreme energies at the Pierre Auger Observatory. This large energy range can be covered by combining data from the surface detector (subdividing the events in a vertical and a horizontal data set), from a denser array of stations and from hybrid events simultaneously recorded by the surface and the fluo ... More
Presented by Francesco FENU on 18/7/2017 at 5:00
We have started a new hybrid air shower experiment at Yangbajing (4300 m a.s.l.) in Tibet since March 2014. This new hybrid experiment consists of the YAC-II comprised of 124 core detectors placed in the form of a square grid of 1.9 m spacing covering about 500 m2, the Tibet-III AS array with the total area of about 50,000 m2 and the underground MD array consists of 80 cells, with the total area o ... More
Presented by Jing HUANG on 17/7/2017 at 8:15
Though the main task of neutrino telescopes with volume about 1 km^3 (IceCube, KM3NeT, GVD) is the search of neutrinos of astrophysical origin, they give a good possibility for investigations of atmospheric muons with energy more than 100 TeV (VHE muons). Measurements of the energy spectrum and angular distribution of such muons give information about primary energy spectrum and mass composition a ... More
Presented by Aleksei BOGDANOV on 14/7/2017 at 4:30
The future SKA-low will provide an extremely dense and very homogeneous antenna array on an area of roughly 0.5 km^2 and with a large bandwidth of 50-350 MHz. With minor engineering changes it would be ideally suited to detect extensive air showers initiated by cosmic rays in the Earth’s atmosphere via their pulsed radio emission. The very precise measurements of individual cosmic-ray air-shower ... More
Presented by Tim HUEGE on 18/7/2017 at 9:00
The Pierre Auger Observatory located near the town of Malargüe (Argentina) is the largest facility for studying cosmic rays above 10^17 eV. The searches for anisotropies in the arrival direction distribution carry important information on the sources distribution and on the propagation of cosmic rays. We update the results of the searches for anisotropies in the distribution of arrival directions ... More
Presented by Ugo GIACCARI on 18/7/2017 at 5:15
During bad weather conditions, muon flux above 1 GeV observed in GRAPES-3 muon telescope shows large variations. The atmospheric electric field is believed to be responsible for acceleration of cosmic ray muons. A thunderstorm event observed on 30 September 2015 is discussed here. The field of view of large area (560 m^2) tracking muon telescope at GRAPES-3 allows study of muon intensity variation ... More
Presented by Balakrishnan HARIHARAN on 17/7/2017 at 7:45
ARIANNA Horizontal Cosmic Ray (HCR) station is an antenna array aiming at detecting RF impulses emitted from nearly horizontal extensive air showers (EAS) generated by cosmic rays above about 0.1 EeV, and ultra-high energy Earth-skimming tau neutrinos coming out from nearby mountains. A prototype station consisting of four log-periodic dipole antennas above the ice, in frequency range of 130-500 M ... More
Presented by Shih-Hao WANG on 18/7/2017 at 8:45
The GRAPES-3 experiment, a high density extensive air shower (EAS) array located at Ooty, India is designed for high precision measurements of cosmic ray energy spectrum and nuclear composition in energy range of 10^{13} – 10^{16} eV. It consists of tightly packed 1 m^2 area 400 plastic scintillation detectors covering an effective area of 25,000 m^2 . The trigger rate and particle density measu ... More
Presented by M. ZUBERI on 13/7/2017 at 5:30
The GRAPES-3 experiment is a unique facility to study cosmic ray energy spectrum and composition with high precision. It consists an array of 400 plastic scinitillation detectors and a muon telescope of 3712 proportional counters to study extensive air shower (EAS) phenomenon around knee ($geq$10$^{15}$ eV). Study of energy spectrum and composition of primary cosmic rays (PCRs) can improve the und ... More
Presented by Anuj CHANDRA on 19/7/2017 at 8:00
The GRAPES-3 is an extensive air shower experiment consisting of ~400 scintillation detectors and 560 m^2 large area tracking muon detector, located at Ooty (2,200 m asl), India. The expansion of the array is in active phase to improve its performance for gamma ray astronomy, and for the study of the chemical composition of the primary cosmic rays above ~10 TeV. During this expansion, both the are ... More
Presented by Akitoshi OSHIMA on 14/7/2017 at 4:45
The Extreme Energy Events Project is aimed to the study of Cosmic Rays and Cosmic Rays-related phenomena, via a synchronous sparse array of 52 tracing detectors (growing), deployed over a broad area covering 10 degrees in latitude and 11 in longitude. The array is composed by both clusters and stand-alone stations, each made of three Multigap Resistive Plate Chambers (MRPC), with a 100 ps single s ... More
Presented by Ivan GNESI on 19/7/2017 at 9:00
The event generator Sibyll can be used for the simulation of hadronic multiparticle production up to the highest energies. Following the update of the long enduring model version 2.1 with the results of fixed target and collider experiments taken in the last decade, we present the revised model version 2.3 that is further improved by adjusting particle production spectra to match the expectation o ... More
Presented by Ralph ENGEL on 13/7/2017 at 7:45
SFLASH is a continuation of the Fluorescence in Air Showers experiment originally run at the SLAC National Laboratory in 2003-2004. SFLASH is designed to measure the absolute fluorescence yield in a developed electromagnetic shower induced by a bunch of about a billion electrons in 1-3 radiation lengths of alumina. These measurements provide a true calibration for fluorescence detectors, such as t ... More
Presented by Charles JUI on 13/7/2017 at 5:15
Some discrepancies have been reported between observed and simulated muon content of extensive air showers: the number of observed muons exceeded the expectations in HiRes-MIA, Yakutsk and Pierre Auger Observatory data. We analyzed the data of the Moscow State University Extensive Air Shower (EAS–MSU) array on > 10 GeV energy muons in showers caused by ∼ 100 PeV primary particles and demonstra ... More
Presented by Mikhail KUZNETSOV on 13/7/2017 at 5:00
The method is described for estimation of the parameters of primary particles of extensive air showers by a complex high mountain detector array, developed in the framework of PAMIR-XXI project. The results can be useful for other high altitude projects as well as for the method of EAS detection in general. We present particular configurations of optical and charged particles detectors, methods of ... More
Presented by Alexander BORISOV on 17/7/2017 at 5:15
We have performed high-resolution simulations of the flux and spectrum of gammas detectable by Fermi-LAT, coming from UHECR-induced cascades, using the state-of-the-art (Gilmore) model of extragalactic background light, ELMAG to simulate the EM cascade (modified to work correctly for the Gilmore EGBL) and CRPropa to simulate the production of EM secondaries from UHECR propagation. We examine the v ... More
Presented by Marco MUZIO on 18/7/2017 at 4:30
Muography is a technique for the imaging of the interior of large size objects, such as mountains, volcanoes with the measurement of the flux of high energy cosmic muons [1,2]. The electrons/positrons, high energy hadrons and low energy muons can contaminate the muon signal. These background sources require a good understanding of the creation processes, as well as reliable simulation frameworks w ... More
Presented by Laszlo OLAH on 15/7/2017 at 5:30
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