动力学聚合方法下的大气反氘核通量
Atmospheric Antideuteron Flux Within a Dynamical Coalescence Approach
AI总结：
本研究采用AMPT模型与动力学聚合模型，结合漏箱模型计算了大气次级反氘核通量，发现其低于BESS上限且在低动能下主导背景，为暗物质间接探测提供了新基线。
摘要：
宇宙反氘核因其超低的天体物理背景，被认为是间接探测暗物质最有前景的工具之一。目前仅存在反氘核通量的上限，但实验探测技术的进步可能很快带来正信号。一个主要的背景来源是宇宙射线与周围介质碰撞产生的次级反氘核。在本研究中，反氘核的产生采用多相输运模型（AMPT）耦合动力学聚合模型进行建模。通过应用广泛使用的漏箱模型并结合特定过程，我们提出了一个由初级宇宙射线与地球大气相互作用产生的大气次级反氘核通量的新理论基线，其中包括三级贡献。我们的结果表明，大气反氘核通量处于各种现有计算结果的范围内，并且远低于超导谱仪气球实验（BESS）设定的上限。研究发现，在动能低于0.26 GeV/n时，大气反氘核主导反氘核背景。
英文摘要：
Cosmic antideuterons are considered as one of the most promising tools for the indirect detection of dark matter due to their ultra-low astrophysical backgrounds. Currently only upper limits on the antideuteron flux exist, but advancements in experimental detection technology may soon lead to positive signals. A major source of background is the production of secondary antideuterons through collisions of cosmic rays with the surrounding medium. In this study, antideuteron production is modeled using a multiphase transport model (AMPT) coupled with a dynamical coalescence model. By applying a widely used leaky box model and incorporating specific processes, we present a new theoretical baseline for atmospheric secondary antideuteron flux, including a tertiary contribution, from primary cosmic rays interacting with Earth's atmosphere. Our results indicate that the atmospheric antideuteron flux are within the range of various existing calculations and remain well below the upper limits set by the Balloon-borne Experiment with a Superconducting Spectrometer (BESS). The atmospheric antideuteron is found to dominate the antideuteron background at kinetic energies below $0.26 $ GeV/n.
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