Optimization of the Neutron Detector Design Based on the 6LiF/ZnS(Ag) Scintillation Screens for the GAMMA-400 Space Observatory
| Autor: | G. L. Dedenko, Renat Faridovich Ibragimov, E.M. Turin, V.A. Idalov, R.N. Zaripov, A.V. Klemetiev, A. A. Taraskin, V.I. Mukhin, A. A. Kaplun, V. V. Kadilin, I.I. Gnezdilov |
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| Rok vydání: | 2015 |
| Předmět: |
electron
Physics::Instrumentation and Detectors Astrophysics::High Energy Astrophysical Phenomena Nuclear Theory orbital Cosmic ray Physics and Astronomy(all) Nuclear physics Observatory calorimeter Neutron detection Neutron gamma-ray Nuclear Experiment Physics Scintillation Calorimeter (particle physics) Gamma ray GAMMA-400 Neutron temperature 6LiF/ZnS(Ag) observatory shower High Energy Physics::Experiment neutron detector hadron rejection |
| Zdroj: | Physics Procedia. 74:199-205 |
| ISSN: | 1875-3892 |
| DOI: | 10.1016/j.phpro.2015.09.192 |
| Popis: | The Neutron Detector (ND) is a new detector sub-system for the future GAMMA-400 space observatory. It aims to complement the instrument's GAMMA-400 electromagnetic calorimeter (CsI(Tl), total depth is 25.0 X 0 ) in identifying cosmic-ray electrons from ∼ 100 MeV up to 3 TeV. Such electrons are of significant scientific interest, but their identification is complicated by the overwhelmingly more abundant hadronic cosmic rays, hence making significant hadronic rejection power of paramount importance. Particle showers initiated by nuclei in the GAMMA-400 calorimeter have a profile different from an electron-induced electromagnetic cascade, and the hadron rejection power deriving from this difference can be significantly enhanced by making use of the thermal neutron activity at late (>100 ns) times relative to the start of the shower. Indeed hadron-induced showers tend to be accompanied by significantly more neutron activity than electromagnetic showers. In the described ND for capturing thermalized neutrons applied isotope 6 Li, which is part of the scintillation screen 6 LiF/ZnS(Ag). ND placed are under the electromagnetic calorimeter. The results GEANT4 simulation of the ND shows that ND has high neutron detection efficiency. |
| Databáze: | OpenAIRE |
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