基于电子宇宙线的暗物质粒子间接探测

The DArk Matter Particle Explorer (DAMPE), is designed to address a number of scientific objectives which include, understanding the mechanisms of particle acceleration in celestial sources and the propagation of cosmic rays in the Galaxy, probing the nature of dark matter, a form of matter necessary to account for gravitational effects observed in very large scale structures such as anomalies in the rotation of galaxies and the gravitational lensing of light by galaxy clusters that cannot be accounted for by the quantity of observed matter. The electron/positron spectra can be used to probe dark matter, although the discrimination from local astrophysical sources may not be trivial. In general the contribution from astro- physical sources is expected to be non-universal, and may induce multiple features on the total energy spectra. DAMPE will accurately measure the energy spectra of electrons/positrons at trans-TeV energies to resolve these potential fine structures, which can be used to test/constrain dark matter models, in order to consistently explain the electron/positron excesses. With DAMPE’s much improved energy resolution, possible new and fine spectral structures on the electron/positron spectra may be revealed as the existence of dark matter particles. We will analyze the data from DAMPE, and get the cosmic-ray electron spectrum and space distribution with high energy resolution, high energy range, high angular resolution and low background.

本项目申请国家自然科学基金委员会-中国科学院空间科学卫星科学研究联合基金的重点项目，研究领域为基于暗物质粒子探测卫星的“卫星数据处理方法及暗物质科学研究”，研究方向名称为“基于电子宇宙线的暗物质粒子间接探测”。. 暗物质粒子空间探测是目前的科学前沿。我国的暗物质粒子探测卫星于2015年12月17日成功发射，到目前为止卫星工作正常，已经成功的收集到31亿高能粒子。本项目希望通过分析暗物质粒子探测卫星数据获取高精度宇宙射线电子能谱，空间分布，在暗物质(暗物质粒子物理性质）和宇宙射线起源、传播、加速机制研究方面取得突破！

本项目计划分析暗物质粒子探测卫星（DAMPE）数据获取高精度宇宙射线电子等的能谱、空间分布，研究暗物质和宇宙射线起源、传播、加速机制。在受资助后我们系统地开展了DAMPE的在轨标定、宇宙线数据分析及相关科学研究、并取得了系列进展, 主要包括: 对25 GeV-5 TeV的电子宇宙线数据进行了精确的测量，并首次以高置信度发现了能谱的拐折行为；对70 GeV-80 TeV的氦核宇宙线能谱进行了精确的测量，发现了34 TeV 处的能谱变软结构；对“悟空”号及AMS-02的电子宇宙射线数据提出了暗物质模型解释, 并对暗物质的物理参数予以了限制。