论文标题
在爆炸性恒星温度下生产准恒星中子场
Production of Quasi-Stellar Neutron Field at Explosive Stellar Temperatures
论文作者
论文摘要
中子引起的不稳定同位素的反应在核合成$ i $ - ，$ r $ - ，$ p $ - ，$ rp $ - 和$νp$中起关键作用 - 在天体物理场景中发生的过程。虽然使用中子飞行时间方法可以直接横截面测量对于长期生存的不稳定同位素，但是当前可用的中子强度（$ \ of cout10^{6} $ n/s）需要大型样品，这些样品对于较短的寿命同位素不可行。在过去的四十年中，$^{7} $ li $（p，n）$反应已用于在恒星温度下提供一个中子场，大约$ 0.3 gk，强度明显更高，从而成功地测量了许多沿$ s $ process路径的横截面。在本文中，我们描述了一种使用这种反应的新方法，可以在$ \ $ \ $ \ $ 1.5-3.5 GK的温度下产生中子场，这与对流壳C/NE燃烧，爆炸性NE/C燃烧和核心循环超新星有关。该方法将允许在爆炸温度下进行许多重要反应的直接横截面测量，例如$^{26} $ Al $（n，p）$，$^{75} $ SE $（n，p）$和$^{56} $ ni $（n，n，p）$。
Neutron-induced reactions on unstable isotopes play a key role in the nucleosynthesis $i$--, $r$--, $p$--, $rp$-- and $νp$--processes occurring in astrophysical scenarios. While direct cross section measurements are possible for long-living unstable isotopes using the neutron Time-of-Flight method, the currently available neutron intensities ($\approx10^{6}$ n/s) require large samples which are not feasible for shorter lifetime isotopes. For the last four decades, the $^{7}$Li$(p,n)$ reaction has been used to provide a neutron field at a stellar temperature of $\approx$ 0.3 GK with significantly higher intensity, allowing the successful measurement of many cross sections along the $s$-process path. In this paper we describe a novel method to use this reaction to produce neutron fields at temperatures of $\approx$ 1.5-3.5 GK, relevant to scenarios such as convective shell C/Ne burning, explosive Ne/C burning, and core-collapse supernovae. This method will allow direct cross section measurements of many important reactions at explosive temperatures, such as $^{26}$Al$(n,p)$, $^{75}$Se$(n,p)$ and $^{56}$Ni$(n,p)$.
