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arXiv 1402.0877nucl-thnucl-ex
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伽莫夫-特勒反应的核模型基准

Benchmarking nuclear models for Gamow-Teller response

E. Litvinova, B. A. Brown, D. -L. Fang, T. Marketin, R. G. T. Zegers

摘要:

核伽莫夫-泰勒反应(GTR)在概念上不同的国家的最先进的方法的比较研究。考虑了三种核微观模型:(i)最近发展的基于协变密度泛函理论的电荷交换相对论时间阻塞近似(RTBA),(ii)扩展“jj 77”模型空间的壳模型(SM)和(iii)具有Brueckner G矩阵有效相互作用的非相对论准粒子无规相近似(QRPA).我们研究的物理情况下,这些模型中的两个或所有三个可以应用。在RTBA和QRPA中计算了~(208)Pb、~(132)Sn和~(78)Ni的Gamow-Teller响应函数。将208-Pb获得的强度与能够进行公司模型基准测试的数据进行比较。对于核132-Sn,也在耦合到振动配置的粒子-空穴(ph)的水平处截断的模型空间内执行SM计算。这允许与RTBA进行一致的比较,其中pH+声子耦合是GTR的扩展宽度和相当大的猝灭的原因。讨论了模型之间的差异及其未来发展的前景。

英文摘要:

A comparative study of the nuclear Gamow-Teller response (GTR) within conceptually different state-of-the-art approaches is presented. Three nuclear microscopic models are considered: (i) the recently developed charge-exchange relativistic time blocking approximation (RTBA) based on the covariant density functional theory, (ii) the shell model (SM) with an extended "jj77" model space and (iii) the non-relativistic quasiparticle random-phase approximation (QRPA) with a Brueckner G-matrix effective interaction. We study the physics cases where two or all three of these models can be applied. The Gamow-Teller response functions are calculated for 208-Pb, 132-Sn and 78-Ni within both RTBA and QRPA. The strengths obtained for 208-Pb are compared to data that enables a firm model benchmarking. For the nucleus 132-Sn, also SM calculations are performed within the model space truncated at the level of a particle-hole (ph) coupled to vibration configurations. This allows a consistent comparison to the RTBA where ph+phonon coupling is responsible for the spreading width and considerable quenching of the GTR. Differences between the models and perspectives of their future developments are discussed.

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