Coexistence phenomena of chemical-bonding-like structures in neutron excess systems

中子过剩体系中类化学键结构的共存现象

• 批准号: 21740211
• 负责人: ITO Makoto
• 金额: $ 3.33万
• 依托单位: Kansai University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21740211/
• 关键词: 中性子過剰核; クラスター構造; 化学結合; 共鳴反応; チャンネル結合計算; 化学結合構造; 分子共鳴状態; 中性子移行反応; モノポール励起; 単極遷移; 核二量体; 二量体; 分子的共鳴状態; 移行反応

The generalized two-center cluster model (GTCM), which can treat covalent and atomic configurations in general two center systems, is applied to the light neutron-excess system, 12Be = . + . + 4N. The intrinsic structure of the excited energy levels is investigated. We found that, in an unbound region, the ionic structures of .+8He and 5He+7He, the atomic structure of 6He+6He are generated although the covalent structures are dominant in the bound region. An exotic superdeformation, which has a hybrid configuration of both the covalent and He-dimer structures, is also realized in the same energy region. The level scheme of these unbound states reveals a strong degenerate feature with a considerable mixture of the different configurations. The present result strongly suggests that such a degenerate feature can be generalized to general neutron-excess systems in the lighter mass region.

广义二中心团簇模型（GTCM）可以处理一般二中心系统中的共价构型和原子构型，应用于轻中子过剩系统， 12Be = 。 + . + 4N。研究了激发能级的内在结构。我们发现，在未结合区域中，虽然在结合区域中共价结构占主导地位，但生成了.+8He和5He+7He的离子结构、6He+6He的原子结构。在同一能量区域还实现了具有共价结构和He二聚体结构的混合配置的奇异超变形。这些未束缚态的能级方案揭示了强烈的简并特征，具有相当大的不同配置的混合。目前的结果强烈表明，这种简并特征可以推广到较轻质量区域的一般中子过剩系统。