Recent status of the Tibet ASγ experiment

Amenomori, M.; Cao, Zhen; Ding, Lei; Feng, Z. Y.; Hibino, K.; Hotta, N.; Huang, Q.; Huo, A. X.; Jia, H. Y.; Jiang, G. Z.; Jiao, S. Q.; Kajino, F.; Kasahara, K.; Labaciren,; Mei, D. M.; Meng, L.; Meng, X. R.; Mimaciren,; Mizutani, K.; Mu, Jun; Nanjo, H.; Nakamura, Masaki; Nusang,; Oguro, A.; Ohnishi, M.; Ohta, I.; Ren, J. R.; Saito, T.; Sakata, M.; Shi, Z. Z.; Shibata, M.; Shirai, T.; Sugimoto, H.; Sun, Xudong; Tai, A.; Taira, K.; Tan, Y. H.; Tateyama, N.; Torii, Shoji; Wang, H.; Wen, C. Z.; Yamamoto, Y.; Yao, Xincheng; Yu, G. C.; Yuan, Peng; Yuda, T.; Zeng, J. G.; Zhang, C. S.; Zhang, H. M.; Zhang, L.; Zhansang,; Zhaxiciren,; Zhou, W. D.

doi:10.1063/1.43876

Cited by 18 publications

(51 citation statements)

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“…• either by using a sparse array of scintillator-based detectors, as for example in the Tibet-AS [12] (for an energy of 100 TeV there are about 50 000 electrons in the shower at mountain-top altitudes), which has already finished operations;…”

Section: Eas Arraysmentioning

confidence: 99%

Design and expected performance of a novel hybrid detector for very-high-energy gamma-ray astrophysics

Assis

Almeida²,

Blanco

et al. 2018

Astroparticle Physics

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Current detectors for Very-High-Energy γ-ray astrophysics are either pointing instruments with a small field of view (Cherenkov telescopes), or large field-of-view instruments with relatively large energy thresholds (extensive air shower detectors).In this article, we propose a new hybrid extensive air shower detector sensitive in an energy region starting from about 100 GeV. The detector combines a small water-Cherenkov detector, able to provide a calorimetric measurement of shower particles at ground, with resistive plate chambers which contribute significantly to the accurate shower geometry reconstruction.A full simulation of this detector concept shows that it is able to reach better sensitivity than any previous gamma-ray wide field-of-view experiment in the sub-TeV energy region. It is expected to detect with a 5σ significance a source fainter than the Crab Nebula in one year at 100 GeV and, above 1 TeV a source as faint as 10% of it.As such, this instrument is suited to detect transient phenomena making it a very powerful tool to trigger observations of variable sources and to detect transients coupled to gravitational waves and gamma-ray bursts.

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Section: Eas Arraysmentioning

confidence: 99%

Design and expected performance of a novel hybrid detector for very-high-energy gamma-ray astrophysics

Assis

Almeida²,

Blanco

et al. 2018

Astroparticle Physics

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“…* Electronic address: samvel˙terantonyan@subr.edu Expression (1) for sharpness parameter ε = 1 can be derived from the superposition of energy spectra resulting from particle acceleration by the diffusive shock waves of Galactic supernova remnants (SNRs) [3][4][5] providing S(E c ) ∝ (E c /E k ) γ1−γ2−1 exp(−E k /E c ) probability density function [6] for the maximal (cutoff) attainable energies (E c ) in accelerating sites. However, the observed rate of change of the spectral slopes derived from EAS experiments in the knee region [7][8][9][10][11][12] actually corresponds to the energy spectral sharpness parameter ε ≫ 1 (so called "sharp knee" phenomenon).…”

Section: Introductionmentioning

confidence: 99%

Sharp knee phenomenon of primary cosmic ray energy spectrum

Ter–Antonyan¹

2014

Phys. Rev. D

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Primary energy spectral models are tested in the energy range of 1 − 200 PeV using standardized extensive air shower responses from BASJE-MAS, Tibet, GAMMA and KASCADE scintillation shower arrays. Results point towards the two-component origin of observed cosmic ray energy spectra in the knee region (GAPS spectral model) consisting of a pulsar component superimposed upon rigidity-dependent power law diffuse galactic flux. The two-component energy spectral model accounts for both the sharp knee shower spectral phenomenon and observed irregularity of allparticle energy spectrum in the region of 50 − 100 PeV. Alternatively, tested multi-population primary energy spectra predicted by non-linear diffusive shock acceleration (DSA) models describe observed shower spectra in the knee region provided that the cutoff magnetic rigidities of accelerating particles are 6±0.3 PV and 45±2 PV for the first two populations respectively. Both tested spectral models confirm the predominant H − He primary nuclei origin of observed shower spectral knee. The parameters of tested energy spectra are evaluated using solutions of inverse problem on the basis of the corresponding parameterizations of energy spectra for primary H, He, O-like and F elike nuclei, standardized shower size spectral responses in the 550 − 1085 g/cm 2 atmospheric slant depth range and near vertical muon truncated size spectra detected by the GAMMA array.

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“…All-particle spectrum obtained in the anomalous diffusion approach. Our results is compared with results from experiments: MSU [26], JACEE [27], Yakutsk [28], AGASA [29], Tibet [30], ATIC-2 [31,32], IceTop-73 [33], Telescope Array [34], HiRes I [35], HiRes II [36], Tunka-133 [37], KASCADE-Grande [38], PAO [39] The non-scattered particles of atomic charge Z contribute to the total flux starting from the energy 3·10 17 Z eV, at which their gyroradius became large enough to escape from the typical Galactic inhomogeneity and reach the observer. This results in a decreasing mean mass of CRs in the energy region (4 · 10 17 ÷ 2 · 10 18 eV) matching the PAO data [4] quite well.…”

Section: Resultsmentioning

confidence: 99%

Particle spectra and mass composition in the ultra-high energy region in the framework of the Galactic origin of cosmic rays

et al. 2017

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Abstract. The possibility for a self-consistent description of all the basic features of the observed cosmic ray spectra and primary composition variations in the energy range of 10 15 ÷ 10 20 eV within the Galactic origin scenario is examined.We assume the existence of Galactic sources that accelerate particles up to ∼ 3 · 10 18 Z eV and take into account a highly inhomogeneous (fractal-like) distribution of matter and magnetic fields in the Galaxy that leads to extremely large free paths of particles ("Lévy flights"), along with an overwhelming contribution to the cosmic ray fluxes observed above ∼ 10 18 eV from particles reaching the Solar System without scattering. Our scenario was refined on the basis of recent experimental results on primary mass composition. Model predictions, which could be verified with the improved high-precision measurements in the nearest future are discussed.

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Recent status of the Tibet ASγ experiment

Cited by 18 publications

References 0 publications

Design and expected performance of a novel hybrid detector for very-high-energy gamma-ray astrophysics

Design and expected performance of a novel hybrid detector for very-high-energy gamma-ray astrophysics

Sharp knee phenomenon of primary cosmic ray energy spectrum

Particle spectra and mass composition in the ultra-high energy region in the framework of the Galactic origin of cosmic rays

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