Nuclear medium effect on neutron capture reactions during neutron star mergers
Nuclear medium effect on neutron capture reactions during neutron star mergers
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DOI：
10.1088/1361-6471/ab9d06
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发表时间：
2020-01
期刊：
影响因子：
--
通讯作者：
K. Ogata;C. Bertulani
中科院分区：
文献类型：
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作者：
K. Ogata;C. Bertulani
引力波的发现证实了旧的理论预测，即由致密恒星形成的双星系统不仅对宇宙学和核天体物理学起着至关重要的作用。作为这些和随后的观测的副产品，现在很清楚，中子星合并可以是宇宙中一半比铁重的元素在一系列快速中子捕获反应（称为r过程）后产生的竞争性场所。本文讨论了在中子星星合并的r过程核合成计算中一直被忽略的一个效应。我们表明，由于中子环境的校正，即使在相对较小的中子密度，中子星星合并的数值流体动力学模拟的范围内，并在发病后的r过程，是不可忽略的，需要考虑到准确地描述由观测确定的元素丰度。
The discovery of gravitational waves has confirmed old theoretical predictions that binary systems formed with compact stars play a crucial role not only for cosmology and nuclear astrophysics. As a byproduct of these and subsequent observations, it is now clear that neutron-star mergers can be a competitive site for the production of half of the elements heavier than iron in the universe following a sequence of fast neutron capture reactions known as the r process. In this article we discuss an effect which has been so far neglected in calculations of r-process nucleosynthesis in neutron star mergers. We show that the corrections due to the neutron environment even at relatively small neutron densities, within the bounds of numerical hydrodynamical simulations of neutron star mergers and after the onset of the r process, are non-negligible and need to be taken into account to accurately describe the elemental abundance as determined by observations.