100 TeV diffuse γ-rays observation by YangBaJing Hybrid Array
摘要
Purpose Cosmic rays up to PeV energy are believed to be generated in our galaxy.γ-rays at 100TeV energies are important probe to identify PeVtrons.Besides,γ-rays contain additional information on the propagation of the galactic cosmic rays.Methods Diffuseγ-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 ofγ-rays excess.Result and conclusion Because of no significant observation onγ-ray emission,Helene's method is adopted to derive the 90%confidence level upper limits on the flux of diffuse galacticγ-rays.And the limit to the ratio of the flux ofγ-rays to CRs is obtained at the order of 10^(-4),which is the current best result at these energies.
基金
supported by National Natural Science Foundation of China under grant:11635011,11761141001,11873005,11765019,11963004
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