Temperature dependence of nuclear spin-isospin response and beta decay in hot astrophysical environments
Temperature dependence of nuclear spin-isospin response and beta decay in hot astrophysical environments
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DOI：
10.1016/j.physletb.2019.135134
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发表时间：
2018-08
影响因子：
4.4
通讯作者：
E. Litvinova;C. Robin;H. Wibowo
中科院分区：
文献类型：
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作者：
E. Litvinova;C. Robin;H. Wibowo
在有限温度相对论核场论框架下，给出了质子-中子核响应的微观方法。该方法基于量子强子动力学中的介子-核子拉格朗日量，将自旋-同位旋响应的相对论场论发展到有限温度无规相近似之外。在介质中的质子-中子相互作用振幅的动力学贡献描述在一个参数自由的方式由单核子和强关联的粒子-空穴激发（声子）之间的耦合在新开发的有限温度形式主义。在这个框架中，我们研究了闭壳层核48 Ca，78 Ni和132 Sn的Gamow-Teller共振和自旋偶极共振的温度依赖性。更广泛的影响，它们的温度依赖性说明了相关的β衰变率和寿命的78镍和132锡在炎热的天体物理环境。我们发现了一个显着的敏感性的β衰变率增强的低能自旋-同位旋强度在有限的温度下，特别是，第一禁戒跃迁的贡献。
A microscopic approach to the proton-neutron nuclear response is formulated in the finite-temperature relativistic nuclear field theory framework. The approach is based on the meson-nucleon Lagrangian of quantum hadrodynamics and advances the relativistic field theory for spin-isospin response beyond the finite-temperature random phase approximation. The dynamical contribution to the in-medium proton-neutron interaction amplitude is described in a parameter-free way by the coupling between the single nucleons and strongly-correlated particle-hole excitations (phonons) within the newly developed finite-temperature formalism. In this framework we investigate temperature dependence of the Gamow-Teller and spin dipole resonances in the closed-shell nuclei48Ca,78Ni, and132Sn. Broader impacts of their temperature dependence are illustrated for the associated beta decay rates and lifetimes of78Ni and132Sn in hot astrophysical environments. We found a remarkable sensitivity of the beta decay rates to the enhanced low-energy spin-isospin strength at finite temperature, in particular, to the contribution of the first-forbidden transitions.