Gamow-Teller strength and beta-decay rate within the self-consistent deformed pnQRPA

6th Nuclear Physics in Astrophysics

物理学;天文学

Martini, M.^1,2 ; Goriely, S.^1 ; Péru, S.^2

Institut d'Astronomie et d'Astrophysique, Université Libre de Bruxelles, CP-226, Brussels

1050, Belgium^1

CEA, DAM, DIF, Arpajon

F-91297, France^2

关键词: Electromagnetic excitations;    Nuclear astro-physics;    Nuclear deformations;    Nuclear excitation;    R-process nucleosynthesis;    Random phase approximations;    Stellar evolutions;    Strength distribution;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/665/1/012057/pdf
DOI  :  10.1088/1742-6596/665/1/012057

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

In recent years fully consistent quasiparticle random-phase approximation (QRPA) calculations using finite range Gogny force have been performed to study electromagnetic excitations of several axially-symmetric deformed nuclei up to the238U. Here we present the extension of this approach to the charge-exchange nuclear excitations (pnQRPA). In particular we focus on the Gamow-Teller (GT) excitations which are known to play a crucial role in several fields of physics, in particular in nuclear astrophysics (stellar evolution and nucleosynthesis). A comparison of the predicted GT strength distribution with existing experimental data is presented. The role of nuclear deformation is shown. Special attention is paid to β-decay halflives calculations for which experimental data exist and for specific isotonic chains of relevance for the r-process nucleosynthesis.