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arXiv 2202.03559astro-ph.HEhep-ph
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cosmic-ray与DRAGON2代码相互作用的FLUKA截面

FLUKA cross sections for cosmic-ray interactions with the DRAGON2 code

Pedro de la Torre Luque, Mario Nicola Mazziotta, Alfredo Ferrari, Francesco Loparco, Paola Sala, Davide Serini

摘要:

在宇宙射线与星际气体的火花反应中产生的次级粒子提供了有价值的信息,使我们能够研究银河系中带电粒子的注入和传输。尽管现有的实验数据非常稀少且不确定,但对这些粒子产生的截面的良好理解对于正确解释我们的模型至关重要。我们已经开发了一套新的截面,包括非弹性和包容性,计算与{ \tt FLUKA}蒙特卡罗核代码,并测试其兼容性与CR数据。非弹性和包容性的截面进行了比较,最新的数据和参数化发现一般良好的协议。然后,这些截面已在{ \tt DRAGON 2}程序中实现,以表征CR核的光谱直到$Z=26$和B,Be和Li的次级与初级比。有趣的是,我们发现,FLUKA截面使我们能够预测的B,Be和Li的通量比,这是兼容的AMS-02数据的能量依赖性,并同时再现这些通量比的缩放低于$20\%$。最后,我们实现了截面的伽马射线的生产,计算{ \tt FLUKA},在{ \tt Gammasky}代码和计算漫射伽马射线天空图和本地HI发射率谱,发现一个非常好的协议与费米大面积望远镜的数据。

英文摘要:

Secondary particles produced in spallation reactions of cosmic rays with the interstellar gas provide valuable information that allow us to investigate the injection and transport of charged particles in the Galaxy. A good understanding of the cross sections of production of these particles is crucial to correctly interpret our models, although the existing experimental data is very scarce and uncertain. We have developed a new set of cross sections, both inelastic and inclusive, computed with the {\tt FLUKA} Monte Carlo nuclear code and tested its compatibility with CR data. Inelastic and inclusive cross sections have been compared to the most up-to-date data and parameterisations finding a general good agreement. Then, these cross sections have been implemented in the {\tt DRAGON2} code to characterize the spectra of CR nuclei up to $Z=26$ and the secondary-to-primary ratios of B, Be and Li. Interestingly, we find that the FLUKA cross sections allow us to predict an energy-dependence of the B, Be and Li flux ratios which is compatible with AMS-02 data and to reproduce simultaneously these flux ratios with a scaling lower than $20\%$. Finally, we implement the cross sections of production of gamma rays, calculated with {\tt FLUKA}, in the {\tt Gammasky} code and compute diffuse gamma-ray sky maps and the local HI emissivity spectrum, finding a very good agreement with Fermi Large Area Telescope data.

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