Structure of 30Mg Studied by beta-decay spectroscopy of spin-polarized 30Na -- shape coexistence in 30Mg --

30Mg 的结构 通过自旋极化 30Na 的 β 衰变光谱研究 -- 30Mg 中的形状共存 --

• 批准号: 22340058
• 负责人: SHIMODA Tadashi
• 金额: $ 12.15万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010-04-01 至 2013-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22340058/
• 关键词: 中性子過剰核; island of inversion; 30Mgの核構造; スピン・パリティ; ガンマ線; ベータ崩壊の非対称性; スピン編極; レーザー光ポンピング; 殻構造の系統的変化; ベータ・ガンマ分光; 核スピンの偏極; shape evolution; 国際共同研究; 殻構造の変化; スピン偏極; β遅発γ分光; 魔法造の変化; intruder configuration; 国際共同実験; 30Mg

We have been studying the structure of Mg isotopes in the region of the N=20 island of inversion, to clarify the structure change as a function of the neutron number. The experiments were performed by our unique method of b-decay spectroscopy taking advantage of highly-spin-polarized radioactive nuclear beams at TRIUMF. The b-decay asymmetry in the Na-isotope decay enables unambiguous spin-parity assignments of the levels in the daughter Mg isotope, and it becomes possible to compare the experimental data and theoretical predictions on a level-by-level basis.The present work focused on the results of the b-decay of 30Na-->30Mg. From the detailed analyses, fourteen g-transitions were newly found and four new levels at 4.683, 4.694, 5.897 and 6.064~MeV were also found in 30Mg. It should be emphasized that the spins and parities of ten levels have been assigned for the first time. Five of them were firmly assigned. An evidence of shape coexistence was proposed.

我们一直在研究镁同位素的结构在该地区的N=20岛的反转，澄清结构的变化作为一个功能的中子数。这些实验是通过我们独特的b-衰变光谱方法进行的，该方法利用了TRIUMF的高自旋极化放射性核束。Na同位素衰变中b衰变的不对称性使得子体Mg同位素中能级的自旋宇称归属明确，并且可以在逐能级的基础上比较实验数据和理论预测。在~（30）Mg中发现了14个新的g跃迁和4个新能级，分别位于4.683，4.694，5.897和6.064~MeV。应该强调的是，十个能级的自旋和宇称是首次分配的。其中五人被坚定地分配。提出了形状共存的证据。

项目成果

スピン偏極した30Naのβ遅発崩壊分光による中性子過剰な30Mgの構造の研究

自旋极化 30Na β 延迟衰变谱研究富中子 30Mg 结构

• 发表时间: 2010
• 作者: K.Tajiri;et al.;田尻邦彦
• 通讯作者: 田尻邦彦

Exploring Mg Isotope Structures through Beta-Delayed Decay of Spin-Polarized Na Isotopes

通过自旋极化钠同位素的β延迟衰变探索镁同位素结构

• 发表时间: 2011
• 作者: Y.Satou;T.Nakamura;Y.Kondo;et al;T.Shimoda
• 通讯作者: T.Shimoda

Structure of Mg Isotope Studied by β-Decay Spectroscopy of Spin-Polarized Na Isotopes--Shape Coexistence in 30Mg

自旋极化Na同位素β衰变谱研究Mg同位素结构--30Mg中的构型共存

• 发表时间: 2012
• 期刊: Progress of Theoretical Physics Supplement
• 作者: 石渡 聡;松本浩典;A.Miyazaki;T. Shimoda et al.
• 通讯作者: T. Shimoda et al.

Studies of neutron-rich nuclear structures through beta-delayed decay of spin-polarized isotopes

通过自旋极化同位素的β延迟衰变研究富中子核结构

• 发表时间: 2011
• 作者: N.Agafonova;et.al;Kazumasa Kuwada;T.Shimoda
• 通讯作者: T.Shimoda

スピン偏極した30Naのβ遅発崩壊分光による中性子過剰な30Mgの構造の研究II

自旋极化30Na II β延迟衰变谱研究富中子30Mg结构

• 发表时间: 2011
• 作者: 宮崎陽平;清水俊;田尻邦彦
• 通讯作者: 田尻邦彦