Impact of complex many-body correlations on electron capture in thermally excited nuclei around Ni78
Impact of complex many-body correlations on electron capture in thermally excited nuclei around Ni78
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DOI：
10.1103/physrevc.103.024326
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发表时间：
2020-11
影响因子：
3.1
通讯作者：
E. Litvinova;C. Robin
中科院分区：
文献类型：
--
作者：
E. Litvinova;C. Robin
我们将在原子核结构特性中起决定性作用的复杂多体关联与恒星演化过程中发生的电子捕获联系起来。最近发展的有限温度响应理论，考虑到单核子和集体自由度之间的耦合，应用于自旋-同位旋跃迁，它支配着电子捕获速率。在核坍缩超新星模拟的背景下，对$^{78}\ maththrm {Ni}$和与核图的高灵敏度区域相关的周围偶偶核进行了计算。所得的电子捕获率与较简单的热准粒子随机相位近似（TQRPA）的电子捕获率进行了比较，TQRPA是这类计算中标准使用的。比较表明，在典型的热力学条件下，超过TQRPA的相关性导致了显著更高的电子捕获率。
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 $^{78}\mathrm{Ni}$ 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.