DAMPE数据中簇射顶点的重建算法及宇宙射线核素的重建效率研究

The fluxes of cosmic ray particles measured precisely are basic data for searching the dark matter particles indirectly and studying the origin of the cosmic rays and their prorogation mechanism in space. The Dark MAtter Particle Explore (DAMPE) is a space-borne detector with the largest energy coverage and the best energy resolution among the running apparatuses in space. DAMPE has been in space almost 22 months since its launch in Dec. 2015. It is important to optimize the event reconstruction algorithms and the simulation software for obtaining a better precision of final results, as well as to maximize the scientific value of the DAMPE. In order to achieve above goals, this proposal mainly studies the primary vertex reconstruction algorithm of hadronic shower, the detection efficiency of cosmic ray particles, Geant4 based simulation software optimization, charged reconstruction algorithm, tracking selection method, the impact of back-scattering particle on the charge measurement and the energy spectra reconstruction of cosmic ray nuclei.

精确测量高能宇宙射线的能谱是间接探测暗物质粒子、研究宇宙射线起源和研究宇宙射线在星际空间传播机制等的重要科学依据。暗物质粒子探测卫星（DAMPE）自2015年12月发射，已经平稳在轨运行近22个月。DAMPE是目前观测能段最宽、能量分辨最优的在轨运行的空间探测器。提高事件重建的精度和优化模拟软件，对于提高测量结果的精度和充分挖掘DAMPE的科学价值具有重要意义。为了实现以上的目标，本申请主要研究：DAMPE事件中簇射顶点的重建算法、宇宙射线的探测效率、Geant4模拟软件的优化、电荷重建算法、径迹选择、反冲粒子对电荷测量结果的影响和重建宇宙射线核素的能谱。

精确测量高能宇宙射线的能谱是间接探测暗物质粒子、研究宇宙射线起源和研究宇宙射线在星际空间传播机制等的重要科学依据。DAMPE是目前观测能段最宽、能量分辨最优的在轨运行的空间探测器。暗物质粒子探测卫星（DAMPE）自2015年12月发射，已经平稳在轨运行5年多的时间。本项目主要目标是提高事件重建的精度和优化模拟软件，对于提高测量结果的精度和充分挖掘DAMPE的科学价值具有重要意义。总体实现了本项目的研究目标。具体地来说，完成了DAMPE事件中簇射顶点的重建算法的开发、完成了宇宙射线的探测效率研究、完成了模拟对最终结果贡献、完成了电荷重建算法、径迹选择、反冲粒子对电荷测量结果的影响研究和重建轻宇宙射线核素的能谱。