100 TeV diffuse $$\gamma $$γ -rays observation by YangBaJing Hybrid Array
2020
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. 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.
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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