Structure of 6 He with an extended three-cluster model
Structure of 6 He with an extended three-cluster model
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具有扩展三团簇模型的 6 He 结构
DOI：
10.1103/physrevc.59.1432
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发表时间：
1999
影响因子：
3.1
通讯作者：
R. Lovas
中科院分区：
文献类型：
--
作者：
K. Arai;Y. Suzuki;R. Lovas
用扩展的微观α+n+n三团簇模型研究了中晕核6He中的核分裂或扭曲效应，其中核心粒子，即α团簇被描述为3N+N两团簇系统.相对于标准的0 S谐振子壳模型描述，双团簇描述改进了α粒子的尾部行为，并使α粒子的第一激发态更加逼真。在6He中允许核心破裂，不仅提高了结合能，而且增加了t+t分量的几率。该模型给出了类似于{α+n+n；t+t}模型的结合能和t+t几率，两者都能再现很小的6He结合能。只有当添加到传统的α+n+n模型中时，t+t通道的加入才能显著加深结合；当扩展的三簇模型增加t+t时，其贡献微乎其微。我们的结果表明，对于像晕核这样的弱束缚系统，由于核的尾部行为影响到晕核子的束缚机制，所以必须现实地对待核的内部运动。
The core breakup or distortion effects in the neutron-halo nucleus 6 He are studied with an extended microscopic α+ n+ n three-cluster model, in which the core particle, ie, the α cluster is described as a 3 N+ N two-cluster system. The two-cluster description improves the tail behavior of the α particle with respect to the standard 0 s harmonic-oscillator shell-model description, and makes the first excited state of the α particle realistic. The allowance for the core breakup in 6 He enhances not only the binding energy but also the probability of the t+ t component. This model gives a binding energy and t+ t probability that are similar to the {α+ n+ n; t+ t} model, and both can reproduce the very small binding energy of 6 He. The inclusion of the t+ t channel deepens the binding substantially only when added to the conventional α+ n+ n model; when the extended three-cluster model is augmented by t+ t, its contribution is insignificant. Our results show that, for a weakly bound system such as a halo nucleus, the core internal motion must be treated realistically since the tail behavior of the core affects the binding mechanism of the halo nucleons.