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arXiv 1108.2680nucl-thnucl-ex
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手征三核子力与丰中子氧同位素的束缚激发态

Chiral three-nucleon forces and bound excited states in neutron-rich oxygen isotopes

J. D. Holt, J. Menendez, A. Schwenk

摘要:

本文研究了基于手征双核子和三核子相互作用的丰中子氧同位素的光谱。首先,我们基准我们的多体方法通过比较基态能量耦合集群的结果相同的两个核子相互作用,总体良好的协议。然后,我们计算束缚激发态在21,22,23 O,专注于三个核子力的作用,在标准sd壳层和一个扩展的sdf 7/2 p3/2价空间。手征三核子力提供重要的一个和两个体之间的贡献价中子。我们发现,这些贡献和扩展的价空间是必要的,以再现新的壳层演化的关键签名,如N = 14幻数和21 O和23 O,这是太压缩与两个核子相互作用的低位状态。对于扩展空间的计算,这是第一次基于核力的工作,没有调整。未来的工作是必要的,并讨论了开放的问题。

英文摘要:

We study the spectra of neutron-rich oxygen isotopes based on chiral two- and three-nucleon interactions. First, we benchmark our many-body approach by comparing ground-state energies to coupled-cluster results for the same two-nucleon interaction, with overall good agreement. We then calculate bound excited states in 21,22,23O, focusing on the role of three-nucleon forces, in the standard sd shell and an extended sdf7/2p3/2 valence space. Chiral three-nucleon forces provide important one- and two-body contributions between valence neutrons. We find that both these contributions and an extended valence space are necessary to reproduce key signatures of novel shell evolution, such as the N = 14 magic number and the low-lying states in 21O and 23O, which are too compressed with two-nucleon interactions only. For the extended space calculations, this presents first work based on nuclear forces without adjustments. Future work is needed and open questions are discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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