短寿命$β^+$发射同位素在Milky Way中心的正电子过剩
Positron excess in the center of the Milky Way from short-lived $β^+$ emitting isotopes
摘要：
INTEGRAL卫星的观测揭示了银河系中心区域在511千电子伏左右的能量存在着尚未解释的过剩。这些伽马射线是在正电子湮灭过程中产生的，所需的速率约为$10^{42}~\mathrm{s^{-1}}$。在这篇简短的论文中，它表明，在亚相对论宇宙射线（CR）与轻核（CNONe）的相互作用中形成的\pos发射同位素可以占中心区域$e^{+}$产生率的相当大的比例-高达百分之几十。
英文摘要：
Observations of the INTEGRAL satellite revealed the presence of yet unexplained excess in the central region of the Galaxy at the energies around 511 keV. These gamma-rays are produced in the process of positron annihilation, the needed rate is around $10^{42}~\mathrm{s^{-1}}$. In this short paper it is shown that \pos -emitting isotopes that are formed in interactions of subrelativistic cosmic rays (CRs) with light nuclei (CNONe) can account for a considerable fraction -- up to several tens of percent -- of $e^{+}$ production rate in the central region.
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