超新星宇宙射线产生的冰前LiBeB
Pregalactic LiBeB Production by Supernova Cosmic Rays
摘要：
我计算的Be和B丰度的演变所产生的宇宙射线产生的大质量恒星在银河系前阶段的宇宙。计算的输入，即恒星形成率和宇宙射线的核丰度，我假设它们与ISM的相同，是从一个详细的宇宙化学演化模型的结果中获得的，该模型的参数最好地拟合了几项观测信息，包括$z\sim 15$对IGM的早期再电离。我发现，当在贫金属晕星中观察到的$^6$ Li平台丰度起源于银河系前宇宙射线核合成时，与$^6$ Li同时产生的Be和B达到了贫金属晕星中检测到的最低水平。用[Fe/H] $\leq -3$观测贫金属晕星中Be和B的丰度，以阐明早期银河系前超新星宇宙线核合成产生$^6$ LiBeB的可能性是很有必要的。
英文摘要：
I calculate the evolution of Be and B abundances produced by cosmic rays generated by massive stars in the pregalactic phase of the universe. The inputs for calculation, i.e. the star formation rate and the nuclear abundances of cosmic rays, which I assume to be the same as those of the ISM, are taken from the results of a detailed cosmic chemical evolution model with its parameters best fitted from several items of observational information including an early reionization of the IGM by $z\sim 15$. I found that when the $^6$Li plateau abundance observed in metal-poor halo stars originated in the pregalactic cosmological cosmic ray nucleosynthesis, Be and B simultaneously produced with $^6$Li amount to the lowest levels ever detected in metal-poor halo stars. It is desirable to observe Be and B abundances in metal-poor halo stars with [Fe/H]$\leq -3$ in order to elucidate the possibility of early $^6$LiBeB production by pregalactic supernova cosmic ray nucleosynthesis.
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