Cosmic Ray钠和铝的光谱以及意外的铝过量
Spectra of Cosmic Ray Sodium and Aluminum and Unexpected Aluminum Excess
摘要：
自发射以来，阿尔法磁谱仪-02（AMS-02）对宇宙射线（CR）种类、$\bar{p}$、$e^{\pm}$和原子核（H-Si、Fe）的光谱进行了高质量的测量，取得了一些突破。AMS-02的最新结果是测量了CR钠和铝的光谱，最高可达$\sim$ 2 TV。由于它们在太阳系中的丰度较低，每种元素的很大一部分都是由较重的物质碎片产生的，主要是Ne，Mg和Si。在本文中，我们使用AMS-02对钠和铝光谱的精确测量，结合ACE-CRIS和Voyager 1数据来测试它们的起源。我们表明，钠光谱与GalProp-HelMod框架的预测一致，而铝光谱显示出显着过剩的刚性范围从2-7 GV。在这种情况下，我们讨论了其他低能量过剩的起源，在Li，F和Fe发现较早。观察到的Li、F和Al的过量似乎与本地沃尔夫-拉叶（WR）星假说一致，该假说被用来重现CR中异常的$^{22}$ Ne/ $^{20}$ Ne、$^{12}$ C/ $^{16}$ O和$^{58}$ Fe/ $^{56}$ Fe比值，而Fe的过量可能与太阳附近过去的SN活动有关。我们还提供了更新的本地星际光谱（LIS）的钠和铝的刚度范围从几MV $\sim$ 2电视。我们的计算采用自洽GalProp-HelMod框架，已被证明是一个可靠的工具，在推导LIS的CR $\bar{p}$，$e^{-}$，和核$Z\le28$。
英文摘要：
Since its launch, the Alpha Magnetic Spectrometer-02 (AMS-02) has delivered outstanding quality measurements of the spectra of cosmic-ray (CR) species, $\bar{p}$, $e^{\pm}$, and nuclei (H-Si, Fe), which resulted in a number of breakthroughs. The most recent AMS-02 result is the measurement of the spectra of CR sodium and aluminum up to $\sim$2 TV. Given their low solar system abundances, a significant fraction of each element is produced in fragmentations of heavier species, predominantly Ne, Mg, and Si. In this paper, we use precise measurements of the sodium and aluminum spectra by AMS-02 together with ACE-CRIS and Voyager 1 data to test their origin. We show that the sodium spectrum agrees well with the predictions made with the GalProp-HelMod framework, while aluminum spectrum shows a significant excess in the rigidity range from 2-7 GV. In this context, we discuss the origin of other low-energy excesses in Li, F, and Fe found earlier. The observed excesses in Li, F, and Al appear to be consistent with the local Wolf-Rayet (WR) stars hypothesis, invoked to reproduce anomalous $^{22}$Ne/$^{20}$Ne, $^{12}$C/$^{16}$O, and $^{58}$Fe/$^{56}$Fe ratios in CRs, while excess in Fe is likely connected with a past SN activity in the solar neighborhood. We also provide updated local interstellar spectra (LIS) of sodium and aluminum in the rigidity range from few MV to $\sim$2 TV. Our calculations employ the self-consistent GalProp-HelMod framework that has proved to be a reliable tool in deriving the LIS of CR $\bar{p}$, $e^{-}$, and nuclei $Z\le28$.
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