Simulation of a soft-gamma-ray polarimeter on board a microsatellite  

作　　者：Xiang‑Man Liu Shu‑Wen Tang Wei Wang Yu‑Hong Yu Zhi‑Yu Sun Yong‑Jie Zhang Fang Fang Duo Yan Shi‑Tao Wang Xue‑Heng Zhang Shu‑Ya Jin Bi‑Tao Hu 

机构地区：[1]Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China [2]School of Nuclear Science and Technology,University of Chinese Academy of Sciences,Beijing 100049,China [3]School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China [4]Department of Astronomy,School of Physics and Technology,Wuhan University,Wuhan 430072,China [5]Wuhan University‑National Astronomical Observatories Joint Center for Astronomy,Wuhan University,Wuhan 430072,China

出　　处：《Nuclear Science and Techniques》2023年第11期64-76,共13页核技术（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(Nos.U2031206,12273086,12133007);the CAS Key Technology Talent Program。

摘　　要：Gamma-ray polarimetry is a new and prospective tool for studying extremely high-energy celestial objects and is of great significance for the field of astrophysics.With the rapid development of microsatellite technology,the advantages of space exploration have become increasingly apparent.Therefore,we simulated a soft-gamma-ray polarimeter for a microsatellite based on the Compton scattering principle.We performed detailed Monte Carlo simulations using monoenergetic gamma-ray linear-polarization sources and Crab-like sources in the energy range of 0.1-10 MeV considering the orbital background.The polarimeter exhibited excellent polarization detection performance.The modulation factor was 0.80±0.01,and the polarization angles were accurate within an error of 0.2°at 200 keV for on-axis incidence.For the Crab-like sources for on-axis incidence,the polarization degrees were consistent with the set values within the error tolerance,the modulation factor was 0.76±0.01,and the minimum detectable polarization reached 2.4%at 3σfor an observation time of10^(6) s.Additionally,the polarimeter exhibited recoil electron tracking,imaging,and powerful background suppression in a large field of view(FoV;∼2πsr).The proposed polarimeter meets the requirements of a space soft-gamma-ray polarization detector and has promising research prospects.

关 键 词：Soft gamma ray Polarization Compton scattering MICROSATELLITE Monte Carlo simulation 

分 类 号：P171[天文地球—天文学]