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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Acknowledgements
This work is partly supported by National Natural Science Foundation of China under grant: 11635011, 11761141001, 11873005, 11765019, 11963004.
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He, JC., Yao, YH., Wang, Z. et al. 100 TeV diffuse \(\gamma \)-rays observation by YangBaJing Hybrid Array. Radiat Detect Technol Methods 4, 392–398 (2020). https://doi.org/10.1007/s41605-020-00198-6
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DOI: https://doi.org/10.1007/s41605-020-00198-6