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arXiv 2303.09775astro-ph.HE
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宇宙射线氘核的现状与新视角

Current status and new perspectives on cosmic ray deuterons

Diego Mauricio Gomez-Coral, Cory Gerrity, Riccardo Munini, Philip von Doetinchem

AI总结:

本研究利用GALPROP和3D太阳调制模型分析大气层顶部氘核通量与氘氦比,发现模型在低能区拟合良好但在高能区低估数据,揭示了轻核与重核传播有效扩散的差异,有待AMS-02进一步解决。

摘要:

氘核是银河系中最丰富的次级宇宙射线物种,但由于实验挑战,其研究一直受到严重限制。在宇宙射线新实验和高精度测量的时代,在宽能量范围内获得低不确定性的氘核通量成为可能。氘核与氦-4的比值($d$/$^4$He)对于理解宇宙射线在银河系和日球层中的传播很重要,它补充了像硼碳比这样较重核的观测。在本研究中,使用{\ t GALPROP}和3D太阳调制模型获得了大气层顶部氘核通量和$d$/$^4$He比的最新结果。研究发现,模拟在模型不确定性范围内描述了1\,GeV/$n$以下的氘核通量和$d$/$^4$He数据。然而,该模型低估了高能下现有最佳已发表测量值。这种差异表明,必须考虑在像氘核这样的轻次级物种与较重核之间存在不同的有效扩散。这要么是轻核与较重核之间传播普遍性破裂的结果,要么是缺乏精确测量,AMS-02将在不久的将来帮助解决这一问题。

英文摘要:

Deuterons are the most abundant secondary cosmic ray species in the Galaxy, but their study has been severely limited due to experimental challenges. In an era with new experiments and high-precision measurements in cosmic rays, having a low-uncertainty deuteron flux in a wide energy range becomes possible. The deuteron-over-helium ratio ($d$/$^4$He) is important to understand the propagation of cosmic rays in the Galaxy and in the heliosphere, complementing observations with heavier nuclei like the boron-to-carbon ratio. In this work, the most up-to-date results of the deuteron flux and the $d$/$^4$He ratio at the top of the atmosphere have been obtained using {\tt GALPROP} and a 3D solar modulation model. It was found that the simulation describes the deuteron flux and $d$/$^4$He data below 1\,GeV/$n$ within the uncertainties of the model. However, the model underestimates the best-published measurements available at high energy. This discrepancy suggests different effective diffusions have to be considered between secondary light species like deuterons and heavier nuclei. Either this is a consequence of a break in the universality of propagation between light and heavier nuclei or a lack of precision measurements, it is something AMS-02 will help to resolve in the near future.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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