Ta 179 ( n , ? ) cross-section measurement and the astrophysical origin of the Ta 180 isotope
Ta 179 ( n , ? ) cross-section measurement and the astrophysical origin of the Ta 180 isotope
复制标题
Ta 179 ( n , ? ) 截面测量和 Ta 180 同位素的天体物理起源
DOI：
10.1103/physrevc.107.045805
复制
发表时间：
2023
影响因子：
3.1
通讯作者：
Garg R
中科院分区：
文献类型：
--
作者：
Garg R
自然界最稀有的（准）稳定同位素及其天体物理起源是一个悬而未决的问题。该同位素的可能产生地点是渐近巨支星的慢中子捕获过程，它可以在不稳定的中子捕获反应中产生。我们报道了一种利用活化技术测量热中子能量横截面的新方法。我们对热截面和共振积分截面的计算结果分别为和。热截面与以前唯一的测量结果很好地吻合[物理学]。[j]，而共振积分则有一个因子的不同。虽然这项工作中的中子能量小于恒星环境中的能量，但我们的结果可能会导致对恒星截面的理论预测的改进。
is nature's rarest (quasi) stable isotope and its astrophysical origin is an open question. A possible production site of this isotope is the slow neutron capture process in asymptotic giant branch stars, where it can be produced via neutron capture reactions on unstable. We report a new measurement of thecross section at thermal-neutron energies via the activation technique. Our results for the thermal and resonance-integral cross sections areandb, respectively. The thermal cross section is in good agreement with the only previous measurement [Phys. Rev. C 60, 025802 (1999)0556-281310.1103/PhysRevC.60.025802], while the resonance integral is different by a factor of. While neutron energies in this work are smaller than the energies in a stellar environment, our results may lead to improvements in theoretical predictions of the stellar cross section.