# TeVPA Conference 2015

26-30 October 2015
Asia/Tokyo timezone
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# Cosmic Rays

Date: from 26 Oct 16:30 to 29 Oct 16:00

## Conveners

• 26 Oct 16:30 - 18:50 UHE
• mteshima, Masahiro
• 27 Oct 14:00 - 16:00 HE
• Prof. Torii, Shoji (Waseda University)
• 29 Oct 14:00 - 16:00 UHE
• mteshima, Masahiro

## Timetable | Contribution List

Displaying 23 contributions out of 23
Type: Oral presentation Session: Cosmic Rays
Track: High Energy Cosmic rays
I explain the excess of the antiproton fraction recently reported by the AMS-02 experiment by considering collisions between cosmic-ray protons accelerated by a local supernova remnant (SNR) and the surrounding dense cloud. The same "pp collisions" provide the right branching fraction to fit the observed positron excess simultaneously without a fine tuning. The supernova happened in relatively lo ... More
Presented by Dr. Kazunori KOHRI on 27/10/2015 at 6:30
Type: Oral presentation Session: Cosmic Rays
Track: High Energy Cosmic rays
We investigate the beginning of cosmic ray (CR) acceleration at supernovae, from the first day to the first few decades following the explosion. We show that supernovae occurring in dense winds should accelerate CR protons to energies E > PeV. We present a detailed study of the maximum CR energy, magnetic field amplification at the shock, and compute fluxes of secondary gamma-rays and neutrinos. ... More
Presented by Dr. Gwenael GIACINTI
Type: Oral presentation Session: Cosmic Rays
Track: High Energy Cosmic rays
Recent precise observations of cosmic rays (CRs) by AMS-02 experiment clearly show (1) harder spectra of helium and carbon compared to protons by $¥propto R^{0.08}$, and (2) concave breaks in proton and helium spectra at a rigidity $R ¥sim 300$ GV. In particular the helium and carbon spectra are exactly similar, pointing to the same acceleration site. We examine possible interpretations of these ... More
Presented by Dr. Yutaka OHIRA on 27/10/2015 at 6:15
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
The Telescope Array (TA) experiment is the largest cosmic ray detector in the Northern Hemisphere. The TA surface detector (SD) array is deployed on a square grid of 1.2 km spacing, covering an effective area of 700 km^2. The TA SD is overlooked by three fluorescence detector (FD) stations: Black Rock Mesa (BRM), Long Ridge (LR), and Middle Drum (MD). The TA BRM and LR stations cover 3 to 33 de ... More
Presented by Dr. Toshihiro FUJII on 26/10/2015 at 7:30
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
We discuss the possible production of ultra-high-energy cosmic rays (UHECRs) in fast winds of active galactic nuclei (AGN). Recent X-ray observations of AGN are revealing the widespread presence of powerful outflows of baryonic material reaching mildly relativistic velocities, in the form of variable, blue-shifted absorption lines of ionized heavy elements. Being discerned in both radio-quiet and ... More
Presented by Dr. Susumu INOUE on 26/10/2015 at 9:10
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
We present a concept for large-area, low-cost detection of ultra-high energy cosmic rays (UHECRs) with a Fluorescence detector Array of Single-pixel Telescopes (FAST), addressing the requirements for the next generation of UHECR experiments. In the FAST design, a large field of view is covered by a few pixels at the focal plane of a mirror or Fresnel lens. We report first results of a FAST prototy ... More
Presented by Dr. Toshihiro FUJII on 29/10/2015 at 6:30
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
We present the lens manufacturing for the near future missions of ultra high energy cosmic rays. The EUSO ultra long duration balloon flight mission and the K-EUSO project have been planed. The balloon optics is compose of two Fresnel lenses and a diffractive lens. The K-EUSO optics is composed of a primary aspherical mirror and a Fresnel lens as a corrector lens. RIKEN will provide Fresnel lenses ... More
Presented by Dr. Yoshiyuki TAKIZAWA on 29/10/2015 at 5:55
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
The key measurement for any experiment which aims to the observe the elusive Ultra High Energy Cosmic Rays (UHECR) from space is related to the UV background in Earth's atmosphere and at the surface. In view of the planned missions (KLYPVE/K-EUSO, JEM-EUSO) bound for the International Space Station (ISS), a small, compact UV telescope, Mini-EUSO, with the aim to the study the UV night emissions fr ... More
Presented by Dr. Oscar LARSSON on 29/10/2015 at 6:45
Type: Oral presentation Session: Cosmic Rays
Track: High Energy Cosmic rays
The formation, electromagnetic structure, and the injection of suprathermal particles into a Fermi-type acceleration at collisionless shocks constitute important problems of high-energy astrophysics. We report on recent particle-in-cell studies of high Mach-number nonrelativistic perpendicular shocks in applications to young supernova remnants. We discuss a nonlinear shock structure mediated by We ... More
Presented by Prof. Jacek NIEMIEC on 27/10/2015 at 6:45
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
Large Hadron Collider forward (LHCf) experiment was motivated to study the hadronic interaction relevant to the air shower development at the very forward of the LHC interaction point. LHCf has measured particle production at LHC 0.9, 2.76, 7 and 13TeV proton-proton collisions and 5TeV proton-Lead collisions. LHCf has tested existing hadronic interaction models and provides strong constraints t ... More
Presented by Takashi SAKO on 26/10/2015 at 8:30
Type: Oral presentation Session: Cosmic Rays
Track: High Energy Cosmic rays
The Pamela spectrometer was launched in 2006 from the cosmodrome of Baikonur, Kazakistan, on board the Russian satellite Resurs-DK1. Since then, it has been collecting cosmic rays from its 70 degrees inclination, 600 km altitude polar orbit. This orbit allows to sample particles of trapped, semi-trapped nature in the Earth geomagnetosphere, of solar origin (emitted in solar particle events), of g ... More
Presented by Dr. Marco CASOLINO on 27/10/2015 at 5:40
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
In the last decade significant progress was made regarding the radio detection of cosmic-ray air showers. Mainly at MHz frequencies, air showers emit a coherent radio pulse in the forward direction, which exceeds the galactic radio background at an energy threshold of roughly 100 PeV. The dominant emission mechanism is the deflection of electrons and positrons in the shower by the geomagnetic fiel ... More
Presented by Dr. Frank SCHRÖDER on 29/10/2015 at 6:10
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
Recent results from the Tibet ASγ experiment will be reported. The presentation will be focused mainly on the high-energy cosmic-ray anisotropy and the research on the Sun’s magnetic field by means of the Sun’s shadow observed by the Tibet air shower array.
Presented by Dr. Takashi SAKO on 26/10/2015 at 8:50
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
KLYPVE/K-EUSO is a detector designed to detect and study Ultra-High-Energy Cosmic Rays (UHECR) from space. It is Russian mission to be located on the International Space Station. It consists of a 3.6m diameter mirror which reflects UV light from UHECR on a Fresnel lens, in turn focusing the signal on a 1.4m focal surface. The focal surface is made up of 1872, 64 channel Hamamatsu PMTs for a total ... More
Presented by Dr. Marco CASOLINO on 29/10/2015 at 14:00
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
We study the chemical composition of Ultra-High Energy Cosmic Rays (UHECRs) primarily using the Xmax technique. The reconstruction techniques use events either seen by two of the TA fluorescence detectors (stereo mode), or by one fluorescence detector, and one fluorescence detector and the TA surface detector (hybrid mode). We compare the observed Xmax distributions to those of shower Monte Carlo ... More
Presented by Dr. Daisuke IKEDA on 26/10/2015 at 7:50
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
We present the results of searching for large- and small-scale anisotropy of ultra-high energy cosmic rays (UHECRs) observed for 7 years by the surface detectors of the Telescope Array experiment. The Telescope Array experiment accumulated the largest UHECR data set in the Northern hemisphere. At small angular scales we examine the data for clustering of events and correlations with various classe ... More
Presented by Dr. Eiji KIDO on 26/10/2015 at 8:10
Type: Oral presentation Session: Cosmic Rays
Track: High Energy Cosmic rays
The ARGO-YBJ experiment has been in stable data taking for more than 5 years at the YangBaJing Cosmic Ray Observatory (Tibet, P.R. China, 4300 m a.s.l., 606 g/cm$^2$). With a duty-cycle of about 87\% the detector collected more than 5$\times$10$^{11}$ events in a wide energy range, from few hundreds GeV up to about 10 PeV. A number of open problems in cosmic ray physics has been faced exploiting ... More
Presented by Dr. Giuseppe DI SCIASCIO
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
EUSO-TA is an on-ground prototype of an orbital Ultra High Energy Cosmic Rays detection mission - JEM-EUSO. It consists of two 1 m2 Fresnel lenses and a 2304 pixel focal surface, with resulting field of view of about 10.5x10.5 degrees, and has been working on Telescope Array site in Black Rock Mesa, Utah, USA since the end of February 2015. We show here first observations of calibration sources su ... More
Presented by Dr. Lech PIOTROWSI on 29/10/2015 at 5:20
Type: Oral presentation Session: Cosmic Rays
Track: High Energy Cosmic rays
Very high energy (E>100 GeV) cosmic electrons and positrons reaching Earth from beyond the solar system are important tracers of recent energetic events in our galactic neighbourhood. Rapid energy losses due to synchrotron radiation and inverse Compton processes result in typical lifetimes of these energetic particles of less than 10^5 years. Their mean free path in the Galaxy is O(1-2) Kpc. Measu ... More
Presented by Mrs. Kathrin MALLOT on 27/10/2015 at 6:00
Session: Cosmic Rays
on 27/10/2015 at 5:20
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
The Telescope Array (TA) collaboration has reported a hotspot of 19 ultrahigh-energy cosmic rays (UHECRs), offering an opportunity to study their origin. Using a universal model with one source and energy-dependent magnetic deections, we show that the distribution of the TA hotspot events is consistent with a single source hypothesis, and that the chance probability of this distribution appearing ... More
Presented by Dr. Shigehiro NAGATAKI on 26/10/2015 at 9:30
Type: Oral presentation Session: Cosmic Rays
Track: Ultra High Energy Cosmic Rays
The photo-detector module (PDM) of the EUSO is composed of 36 Hamamatsu multi-anode photomultipliers (64 channels per tube), and 36 photon counting readout ASICs, for a total of 2304 channels. We present the calibration of the detection efficiency of the PDM.
Presented by Dr. Yoshiya KAWASAKI on 29/10/2015 at 5:40
Type: Oral presentation Session: Cosmic Rays
Track: High Energy Cosmic rays
Using a LHAASO wide field of view Cherenkov telescope and the ARGO-YBJ resistive plate chamber array as 4300m a.s.l., the energy spectrum of cosmic hydrogen and helium nuclei (H&He) between 100 TeV and 3 PeV is measured. A clear knee feature is observed around 630 TeV in the spectrum with an energy resolution of about 25%. Below 300 TeV, the data from direct charge measurements provide rather prec ... More
Presented by Dr. Zhen CAO on 27/10/2015 at 5:00
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