论文标题
硬板上的硬X射线成像器的轨内仪器背景的起源
Origin of the in-orbit instrumental background of the Hard X-ray Imager onboard Hitomi
论文作者
论文摘要
理解和减少轨内仪器背景对于在硬X射线天文观测中实现高灵敏度至关重要。 HOTOMI卫星在船上硬X射线成像器（HXI）的观察数据提供了有关背景组件的有用信息，这是由于其多层配置具有不同的原子数：HXI由四层Si（Z = 14）组成的堆栈由CDTE（Z = 14）的四层（Z = 14）和一层CDTE（Z = 48，52）vertector 3.（52）vertector bfee 32，52 botecter bgo bfee 32，52 botector bgo bfee bgo周围环绕周围的周围环绕量。盾牌。基于观察数据，顶部SI层的背景，三个基础SI层和CDTE层的背景分别由不同的组件（即低能电子，反照率中子和质子诱导的放射性活化）所支配。蒙特卡洛对HXI的轨内背景的模拟良好地重现了每一层的观察到的背景谱，从而定量验证了上述假设。此外，我们建议包含电子屏蔽以减少背景。
Understanding and reducing the in-orbit instrumental backgrounds are essential to achieving high sensitivity in hard X-ray astronomical observations. The observational data of the Hard X-ray Imager (HXI) on board the Hitomi satellite provides useful information on the background components, owing to its multi-layer configuration with different atomic numbers: the HXI consists of a stack of four layers of Si (Z = 14) detectors and one layer of CdTe (Z = 48, 52) detector surrounded by well-type BGO (Bi4Ge3O12) active shields. Based on the observational data, the backgrounds of top Si layer, the three underlying Si layers, and the CdTe layer are inferred to be dominated by different components, namely, low-energy electrons, albedo neutrons, and proton-induced radioactivation, respectively. Monte Carlo simulations of the in-orbit background of the HXI reproduce the observed background spectrum of each layer well, thereby verifying the above hypothesis quantitatively. In addition, we suggest the inclusion of an electron shield to reduce the background.
