Neutron-induced reactions on unstable isotopes play a key role in the nucleosynthesis i-, r-, p-, rp- and \(\nu p\)-processes occurring in astrophysical scenarios. While direct cross section measurements are possible for long-lived unstable isotopes using the neutron Time-of-Flight method, the currently available neutron intensities (\(\approx 10^{6}\) n/s) require large samples which are not feasible for shorter-lived isotopes. For the last three decades, the \(^{7}\)Li(p, n) reaction has been used with thick lithium targets 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 enable the use of high intensity proton beams with thick lithium targets to provide several orders of magnitude increase in the available neutron intensity relative to state-of-the-art neutron Time-of-Flight facilities, hence 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).

中文翻译：

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在爆炸恒星温度下产生准星状中子场

在不稳定的同位素中子诱发反应起到核合成的关键角色我- ，- [R - ， - p - ，RP -和\（\ NU p \） -processes在天体物理情景的发生。虽然使用中子飞行时间方法可以对长寿命的不稳定同位素进行直接截面测量，但是当前可用的中子强度（\（\大约10 ^ {6} \） n / s）需要大样本，而这些样本并不需要对于寿命较短的同位素是可行的。在最近的三十年中，\（^ {7} \） Li（p，  n）反应已与厚的锂靶一起使用，以在恒星温度\（\ approx \）下提供中子场。0.3 GK具有更高的强度，可以成功地测量s加工路径上许多横截面。在本文中，我们描述了一种利用此反应在\（\ approx \） 1.5–3.5 GK温度下产生中子场的新方法，该方法与对流壳C / Ne燃烧，爆炸性Ne / C燃烧和堆芯有关崩溃的超新星。这种方法将能够使用具有厚锂靶的高强度质子束，从而相对于最新的中子飞行时间设备，可利用的中子强度增加几个数量级，因此将允许直接截面爆炸温度下许多重要反应的测量值，例如\（^ {26} \） Al（n， p），\（^ {75} \） Se（n，  p）和\（^ {56} \） Ni（n，  p）。