100 TeV diffuse γ-rays observation by YangBaJing Hybrid Array

Jian-Cheng He; Yu-Hua Yao; Zhen Wang; Tian-Lu Chen; Dan-Zeng-Luo-Bu; Cun-Feng Feng; Youliang Feng; Qi Gao; Yi-Qin Guo; Ying-Ying Guo; Hong-Bo Hu; Xing-Tao Huang; Cheng Liu; Mao-Yuan Liu; Yi-Bin Pan; Bing-Qiang Qiao; Guang-Guang Xin; Xue-Yao Zhang; Yi Zhang; Shi-Ping Zhao

doi:10.1007/s41605-020-00198-6

Volume 4 Issue 3

Sep. 2020

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Abstract

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Radiation Detection Technology and Methods > 2020 > 4(3): 392-398 > doi: 10.1007/s41605-020-00198-6

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100 TeV diffuse γ-rays observation by YangBaJing Hybrid Array

1. Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences(CAS), Beijing, 100049, China;
2. University of Chinese Academy of Sciences(UCAS), Beijing, 100049, China;
3. College of Physics, Sichuan University, Chengdu, 610064, China;
4. Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, 200240, China;
5. Physics Department of Science School, Tibet University, Lhasa, 850000, China;
6. Institute of Frontier and Interdisciplinary Science, Shandong University, Jinan, 250100, China;
7. Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences(CAS), Nanjing, 210008, China;
8. Department of Physics, University of Wisconsin-Madison, 1150 University ave Madison, Madison, WI, 53706, USA;
9. School of Physics and Technology, Wuhan University, Wuhan, 430072, China

Funds:

This work is partly supported by National Natural Science Foundation of China under grant:11635011,11761141001,11873005,11765019,11963004.

More Information

Received Date: June 15, 2020
Revised Date: July 17, 2020
Accepted Date: July 23, 2020
Available Online: October 17, 2022
Published Date: August 11, 2020

Abstract

Abstract

Purpose Cosmic rays up to PeV energy are believed to be generated in our galaxy. $\gamma$ -rays at 100 TeV energies are important probe to identify PeVtrons. Besides, $\gamma$ -rays contain additional information on the propagation of the galactic cosmic rays.
Methods Diffuse $\gamma$ -rays originating from the Galactic plane from 20 to 200 TeV region are studied with early 160-day data collected by YangBaJing Hybrid Array (YBJ-HA), which is a hybrid array and consists of scintillation detectors and underground muon detectors. All-distance equi-zenith angle and time-swapping methods are used to analyze the number of $\gamma$ -rays excess.
Result and conclusion Because of no significant observation on $\gamma$ -ray emission, Helene’s method is adopted to derive the $90\%$ confidence level upper limits on the flux of diffuse galactic $\gamma$ -rays. And the limit to the ratio of the flux of $\gamma$ -rays to CRs is obtained at the order of $10 ^{-4}$ , which is the current best result at these energies.

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References (27)

References

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Jian-Cheng He, Yu-Hua Yao, Zhen Wang, et al. 100 TeV diffuse γ-rays observation by YangBaJing Hybrid Array[J]. Radiation Detection Technology and Methods, 2020, 4(3): 392-398. DOI: 10.1007/s41605-020-00198-6

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