Electromagnetic nuclear moments around neutron magic number 20 and 28

中子幻数 20 和 28 周围的电磁核矩

• 批准号: 22340071
• 负责人: UENO Hideki
• 金额: $ 12.48万
• 依托单位: The Institute of Physical and Chemical Research
• 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 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22340071/
• 关键词: 核電磁モーメント; 核スピン偏極; β-NMR法; γ線摂動角分布法; 殻構造; RIビーム; 魔法数; 中性子過剰核; ＲＩビーム; 核磁気共鳴法; 摂動角分布法; 国際研究者交流; 入射核破砕反応; 殻模型

The purpose of this study is to investigate the structure of far neutron-rich nuclei around neutron magic number N = 20 and 28 through the measurement of electromagnetic nuclear moments. In the nuclear region of N = 20, a ground-state electric quadrupole (Q) moment of 33Al was measured at GANIL, France. The obtained Q shows a large outward discrepancy from a single particle value and shell model calculations within the conventional sd model space, suggesting the erosion of N = 20 shell closure. For the N = 28 region, the Q moment of the isomeric state of 43S at 320 keV was measured at the RIKEN RIBF facility. The data shows that the 43S deformation is modest in spite of the level inversion, suggesting a strong deformation of the ground state and a shape coexistence in the low-lying states. In this study, a noble method to produce spin-aligned RI beams utilizing two-step fragmentation reaction combined with momentum dispersion-matching of the ion optics technique has been developed.

本研究的目的是通过电磁核矩的测量来研究中子幻数N = 20和28附近远丰中子核的结构。在N = 20的核区域，在法国GANIL测量了33Al的基态电四极矩。在常规sd模型空间内，得到的Q值与单颗粒值和壳模型计算值有很大的向外差异，表明N = 20壳封闭的侵蚀。对于N = 28区域，在RIKEN RIBF设施测量了320 keV下43 S异构态的Q矩。数据表明，43 S的形变是温和的，尽管水平反转，这表明一个强大的变形的基态和形状共存的低洼状态。在这项研究中，一个高贵的方法来产生自旋取向RI光束利用两步碎裂反应结合动量色散匹配的离子光学技术已经开发出来。

项目成果

RIBF research activities with slowed-down/stopped RI beams

使用减速/停止 RI 光束的 RIBF 研究活动

• 发表时间: 2013
• 作者: H. Ueno

Measurement of nuclear magnetic moment of unstable nucleus ^<40>Sc

不稳定核^<40>Sc核磁矩的测量

• 发表时间: 2011
• 作者: H. Ueno;上野秀樹;上野秀樹;H. Ueno;S .Takeuchi;Y. Ichikawa;Z.X.Cao;市川雄一;H. Ueno;石橋陽子
• 通讯作者: 石橋陽子

Beta-delayed neutron and gamma-ray spectroscopy of ^<17>C utilizing spin-polarized ^<17>B

利用自旋极化^<17>B的^<17>C的β延迟中子和伽马射线能谱

• DOI: 10.1103/physrevc.87.034316
• 发表时间: 2012
• 期刊: Phys. Rev
• 作者: H. Ueno;K. Asahi;他
• 通讯作者: 他

Spin polarization phenonema of unstable exotic beam experiment

不稳定奇异光束实验的自旋偏振现象

• 发表时间: 2010
• 作者: E.Yu.Nicolskii;K.Yoneda;Y.Togano;et al;吉田直貴;米田健一郎;米田健一郎;K. Yoneda;K.Yoneda;Y. Ichikawa;市川雄一;上野秀樹;上野秀樹;飯島裕章;K.Yoneda;H. Ueno
• 通讯作者: H. Ueno

TDPAD法を用いた^<32>Alアイソマーの磁気モーメント測定

使用TDPAD方法测量^<32>Al异构体的磁矩

• 发表时间: 2010
• 作者: Y. Togano;K. Yoneda;市川雄一;石井裕司
• 通讯作者: 石井裕司