Prospects for direct neutron capture measurements on s-process branching point isotopes
Prospects for direct neutron capture measurements on s-process branching point isotopes
复制标题
DOI：
10.1140/epja/i2017-12261-2
复制
发表时间：
2017-05-10
影响因子：
2.7
通讯作者：
Reifarth, R.
中科院分区：
文献类型：
--
作者：
Guerrero, C.;Domingo-Pardo, C.;Reifarth, R.
在 s 过程中充当分支点的几种不稳定关键同位素的中子俘获截面对于恒星核合成研究至关重要，但由于难以生产足够的样品材料、所得样品的高活性以及需要高中子通量和有效背景抑制能力的实际 (n，gamma) 测量，直接测量它们非常具有挑战性。目前，大约有 21 种相关的 s 过程分支点同位素，其截面在天体物理学感兴趣的中子能量范围内尚无法测量。然而，随着一些最新的发展和即将推出的技术，情况正在发生变化。这项工作介绍了三种将改变该领域当前范例的技术：在（n，gamma）实验中使用伽马射线成像技术，使用高功率激光器产生慢化中子束，以及麦克斯韦中子束的双俘获实验。
The neutron capture cross sections of several unstable key isotopes acting as branching points in the s-process are crucial for stellar nucleosynthesis studies, but they are very challenging to measure directly due to the difficult production of sufficient sample material, the high activity of the resulting samples, and the actual (n, gamma) measurement, where high neutron fluxes and effective background rejection capabilities are required. At present there are about 21 relevant s-process branching point isotopes whose cross section could not be measured yet over the neutron energy range of interest for astrophysics. However, the situation is changing with some very recent developments and upcoming technologies. This work introduces three techniques that will change the current paradigm in the field: the use of gamma-ray imaging techniques in (n,gamma) experiments, the production of moderated neutron beams using high-power lasers, and double capture experiments in Maxwellian neutron beams.