Isospin dynamics in nuclear structure

Isospin dynamics in nuclear structure
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核结构中的同位旋动力学

DOI:
10.1051/epjconf/201818202075
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发表时间:
2018
影响因子:
--
通讯作者:
Kabana, S.
Kabana, S.
中科院分区:
--
文献类型:
--
作者:
Litvinova, Elena;Robin, Caroline;Schuck, Peter;Aharonov, Y.;Bravina, L.;Kabana, S.

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我们讨论了与同位旋转移有关的核多体问题的一些特殊方面。主要感兴趣的量是质子-中子性质的粒子空穴组态的介质内传播子,它决定了核对同位旋转移外场的响应。研究最多的激发模式之一是Gamow-Teller共振,因此,它可以作为对理论方法的灵敏检验。它的低能部分,负责贝塔衰变的半衰期,对此特别方便。以GTR为基准的模型可以用来预测在核稀有同位素束设施和天体物理学中研究的其他更奇怪的激发。就精度而言,这种分析的主要问题是区分与潜在相互作用有关的影响和由多体关联引起的影响。因此,(I)基于核子-核子相互作用的基本概念的方法是首选的方法,(Ii)包括复杂的多体动力学。我们讨论了在采取这种方法的道路上取得的进展和遇到的障碍。
We discuss some special aspects of the nuclear many-body problem related to isospin transfer. The major quantity of interest is the in-medium propagator of a particlehole configuration of the proton-neutron character, which determines the nuclear response to isospin transferring external fields. One of the most studied excitation modes is the Gamow-Teller resonance (GTR), which can, therefore, be used as a sensitive test for the theoretical approaches. Its low-energy part, which is responsible for the beta decay halflives, is especially convenient for this. Models benchmarked against the GTR can be used to predict other, more exotic, excitations studied at nuclear rare isotope beam facilities and in astrophysics. As far as the precision is concerned, the major problem in such an analysis is to disentangle the effects related to the underlying interaction and those caused by the many-body correlations. Therefore, approaches (i) based on fundamental concepts for the nucleon-nucleon interaction which (ii) include complex many-body dynamics are the preferred ones. We discuss progress and obstacles on the way to such approaches.
相对论准粒子时间阻塞近似:开壳核的偶极子响应
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