Abstract
The GAMMA-400 gamma-ray telescope is planned for the launch at the end of 2026 on the Navigator service platform designed by Lavochkin Association on an elliptical orbit with following initial parameters: an apogee \({\sim}\)300 000, a perigee \({\sim}\)500 km, a rotation period \({\sim}\)7 days and inclination of 51.4\({}^{\circ}\). The apparatus is expected to operate for more than 5 years, reaching an unprecedented sensitivity for the search of dark matter signatures and the study of the unresolved and so far unidentified gamma-ray sources. The segmented anticoincidence counters surround the converter-tracker and calorimeter of the telescope with the purpose of vetoing to assure a clean track reconstruction and charged particle background suppression. The anticoincidence detector prototype based on long BC-408 scintillator with silicon photomultipliers readout was tested using 300-MeV positron beam of synchrotron C-25P ‘‘PAKHRA’’ of Lebedev Physical Institute. The measurement setup, design concepts for the prototype detector together with test results are discussed.
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ACKNOWLEDGMENTS
The authors thank for the support from National Research Nuclear University MEPhI in the framework of the Russian Academic Excellence Project (contract no. 02.a03.21.0005, 27.08.2013).
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Arkhangelskiy, A.I., Galper, A.M., Arkhangelskaja, I.V. et al. The Anticoincidence System of Space-Based Gamma-Ray Telescope GAMMA-400, Test Beam Studies of Anticoincidence Detector Prototype with SiPM Readout. Phys. Atom. Nuclei 83, 252–257 (2020). https://doi.org/10.1134/S1063778820020039
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DOI: https://doi.org/10.1134/S1063778820020039