报告题目：Cosmic ray Deuteron flux measurement with DAMPE

报告人：熊峥 博士后（意大利格兰萨索科学研究所）

报告摘要：Cosmic-ray deuterons have long been considered a purely secondary component, predominantly produced through the spallation of heavier nuclei, such as ⁴He, on the interstellar medium. Thus, the deuteron component provides a unique and complementary probe of light-nuclei propagation in the Galaxy, beyond traditional observables like the B/C ratio, and may also unveil possible exotic astrophysical processes.

Recent experimental results have revealed intriguing tensions. AMS-02 found the D/p ratio stable at about 2.7% above 13 GV, while the SOKOL experiment suggests a much larger fraction, with D/(D+p) up to nearly 37% at TeV energies. These discrepancies motivate a precise and independent measurement of cosmic-ray deuterons in the TeV energy range.

In this work, we describe a method for the measurement (on a statistical basis) of the deuteron fraction by using the difference in its interaction cross section with respect to protons. The analysis fully exploits the capabilities of DAMPE detector, with its deep and longitudinally segmented BGO calorimeter, enabling a detailed characterization of hadronic shower development. We can consequently derive the DAMPE sensitivity in the deuteron search and explore the region of the aforementioned tensions.

报告时间：2026年10月14日（周三）上午10点

报告地点：紫台仙林园区3号楼201会议室

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