Method to select gamma rays with energy above 50 GeV against a charge-particle background in the GAMMA-400 space telescope

International Conference on Particle Physics and Astrophysics

Kheymits, M.D.^1 ; Leonov, A.A.^1 ; Galper, A.M.^1,2 ; Kadilin, V.^1 ; Arkhangelskaya, I.V.^1 ; Arkhangelskiy, A.I.^1 ; Gusakov, Yu V^2 ; Zverev, V.G.^1 ; Kaplin, V.^1 ; Naumov, P.Yu.^1 ; Runtso, M.F.^1 ; Suchkov, S.I.^2 ; Topchiev, N.P.^2 ; Yurkin, Yu.T.^1 ; Bakaldin, A.^1 ; Dalkarov, O.^2

National Research Nuclear University MEPhI, Kashirskoe Shosse 31, Moscow

115409, Russia^1

P. N. Lebedev Physical Institute of the Russian, Academy of Sciences, Leninskij Prospekt 53, Moscow

119991, Russia^2

关键词: Charge particles;    Gamma quanta;    Gamma-ray detection;    High energy gamma rays;    Low-energy;    Particle rejection;    Time of flight systems;    Time separation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/675/3/032011/pdf
DOI  :  10.1088/1742-6596/675/3/032011

来源: IOP

【 摘 要 】

Studying high-energy (>50GeV) cosmic gamma radiation raises a problem of selection of neutral gamma rays from a background of charged particles. The problem is embarrassed by the backsplash effect. The backsplash consists, in the main, of low-energy (1 MeV) secondary photons moving backwards and is produced by any high-energy gamma quantum. A charged-particle rejection method using the anticoincidence and time-of-flight systems is proposed. Charged-particle events are distinguished from those being triggered by high-energy gamma-rays producing backsplash. The method is based on the time separation of signals. It allows us to keep the gamma-ray detection efficiency high up to high energies.