论文标题
复杂的多体相关性对$^{78} $ ni的热激发核中电子捕获的影响
Impact of complex many-body correlations on electron capture in thermally excited nuclei around $^{78}$Ni
论文作者
论文摘要
我们将在原子核的结构特性中起决定性作用的复杂多体相关性与恒星进化过程中发生的电子捕获。最近开发的有限温度响应理论考虑了单核子和集体自由度之间的耦合，应用于自旋 - 以异能转变，该转变主导了电子捕获速率。计算是针对$^{78} $ ni执行的，并且在核心偏曲超新星模拟的背景下，与核图表的高敏性区域相关的周围偶数核进行了计算。将获得的电子捕获率与更简单的热准粒子随机相近似（TQRPA）的捕获率进行了比较，该相位是在此类计算中标准使用的。比较表明，在典型的热力学条件下，TQRPA以外的相关性导致电子捕获率明显更高。
We link complex many-body correlations, which play a decisive role in the structural properties of atomic nuclei, to the electron capture occurring during star evolution. The recently developed finite-temperature response theory, taking into account the coupling between single-nucleon and collective degrees of freedom, is applied to spin-isospin transitions, which dominate the electron capture rates. Calculations are performed for $^{78}$Ni and for the surrounding even-even nuclei associated with a high-sensitivity region of the nuclear chart in the context of core-collapse supernova simulations. The obtained electron capture rates are compared to those of a simpler thermal quasiparticle random phase approximation (TQRPA), which is standardly used in such computations. The comparison indicates that correlations beyond TQRPA lead to significantly higher electron capture rates under the typical thermodynamical conditions.
