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arXiv 0904.4775nucl-thnucl-ex
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波罗梅核连续偶极跃迁中的两粒子关联

Two-particle correlations in continuum dipole transitions in Borromean nuclei

K. Hagino, H. Sagawa, T. Nakamura, S. Shimoura

摘要:

本文讨论了典型弱束缚博罗米安核$^{11}$ Li和$^6$ He的偶极激发两个发射中子的能量和角分布。为此,我们使用一个三体模型与密度依赖的价中子之间的接触相互作用。我们的计算表明,虽然两个核在基态表现出相似的强双中子关联,但它们的价中子能量分布有很大的不同。这种能量分布的不同行为主要反映了中子和核心核之间的相互作用,而不是价中子之间的相互作用。也就是说,这种差异可以归因于在$^{11}$ Li的中子-芯系统中存在s波虚态,而在$^6$ He中不存在。指出在低能区$^{11}$ Li的角分布表现出强双中子关联效应,而$^{6}$ He的角分布则表现出强双中子关联效应.

英文摘要:

We discuss the energy and angular distributions of two emitted neutrons from the dipole excitation of typical weakly-bound Borromean nuclei, $^{11}$Li and $^6$He. To this end, we use a three-body model with a density dependent contact interaction between the valence neutrons. Our calculation indicates that the energy distributions for the valence neutrons are considerably different between the two nuclei, although they show similar strong dineutron correlations in the ground state to each other. This different behaviour of the energy distribution primarily reflects the interaction between the neutron and the core nucleus, rather than the interaction between the valence neutrons. That is, the difference can be attributed to the presence of s-wave virtual state in the neutron-core system in $^{11}$Li, which is absent in $^6$He. It is pointed out that the angular distribution for $^{11}$Li in the low energy region shows a clear manifestation of the strong dineutron correlation, whereas the angular distribution for $^{6}$He exhibits a strong anticorrelation effect.

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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