利用暗物质探测卫星数据测量10GeV/n到2TeV/n的硼碳通量比

The acceleration and propagation mechanism of cosmic rays has been one of the most fundamental problems in astronomical research, and the boron to carbon flux ratio (B / C) is considered to be the "standard" tool for studying this mechanism. Cosmic ray detection experiments, including balloon experiments (eg, ATIC, CREAM), satellite experiments (eg PEMELA) and international space station experiments (AMS-02, CALET) have been extensively carried out internationally. These experiments have published their measurements of boron to carbon flux ratio. In the energy region above 100 GeV / n, limited by the design goals of these experiments, a confident result is still not achieved due to the insufficient dynamic range of energy measurements or low statistics. The Dark Matter Particle Explorer (DAMPE) is the first satellite experiment to focus on high energy cosmic ray research in China. The DAMPE detector has the inherent advantages of wide dynamic range and high energy measurement accuracy especially in high energy range. To measure the boron to carbon ratio with the DAMPE in-orbit data is expected to provide the result from 10GeV / n to 2TeV / n energy segments with higher accuracy and statistics, which is much helpful for testing the existing cosmic ray propagation model and seeking for out-expected new phenomenon.

宇宙射线的加速和传播机制一直是天文学研究致力于解答的最基本的问题之一，硼碳粒子通量比(B/C)被认为是研究这一机制的“标准”工具。空间宇宙射线探测实验在国际上已经被广泛开展，包括高空气球实验（如ATIC，CREAM）,卫星实验（如PEMELA）及国际空间站实验（AMS-02, CALET）。这些实验已经发表了其硼碳比测量相关结果，但是对于100GeV/n以上的高能量段，限制于不同实验的设计目标，已有的实验或是超出了能量测量的动态范围，或是统计量较低，尚不能给出较确信的结果。空间暗物质粒子探测器卫星（DAMPE）是国内首个致力于高能宇宙射线研究的卫星实验，DAMPE探测器具有宽动态范围和高能量测量精度的先天优势。利用DAMPE在轨数据开展硼碳比的测量，有望在10GeV/n到2TeV/n能段给出高精度和高统计量的测量结果，有助于检验现有的宇宙射线传播模型和发现超出理论预期的新现象。

宇宙射线的加速和传播机制一直是天文学研究致力于解答的最基本的问题之一，硼碳粒子通量比(B/C)被认为是研究这一机制的“标准”工具。在本课题经费支持下，项目团队从模拟和束流实验验证出发，充分研究了DAMPE探测器对核素测量的性能。然后利用在轨模拟和实测数据，研究了事例选择、电荷及能量重建、核素通量谱等计算和修正方法，给出了硼碳通量谱的测量结果，为硼碳比物理结果的最后发表准备了条件。基于DAMPE数据测量的硼碳比结果的发表，将有利于弥补现有实验数据在高能区精度的不足，检验现有宇宙射线传播模型理论及可能发现超出理论预期的新现象。