Evolution of Octupole Deformation in Radium Nuclei from Coulomb Excitation of Radioactive ^{222}Ra and ^{228}Ra Beams.-猫眼课题宝

DOI：

10.1103/physrevlett.124.042503

发表时间：

2020-01

期刊：

Physical review letters

影响因子：

8.6

通讯作者：

中科院分区：

物理与天体物理1区

文献类型：

作者：

P. Butler;L. Gaffney;P. Spagnoletti;K. Abrahams;M. Bowry;J. Cederkäll;G. de Angelis;H. De Witte;P. Garrett;A. Goldkuhle;C. Henrich;A. Illana;K. Johnston;D. Joss;J. Keatings;N. Kelly;M. Komorowska;J. Konki;T. Kröll;M. Lozano;B. S. Nara Singh;D. O’Donnell;J. Ojala;R. Page;L. Pedersen;C. Raison;P. Reiter;Julia Bella Rodriguez;D. Rosiak;S. Rothe;M. Scheck;M. Seidlitz;T. Shneidman;B. Siebeck;J. Sinclair;J. F. Smith-J. F.-Smith-2127105908;M. Stryjczyk;P. Van Duppen;S. Viñals;V. Virtanen;N. Warr;K. Wrzosek-Lipska;M. Zielińska

有稀疏的直接实验证据表明，原子核可以表现出由强八极相关引起的稳定的“梨”形。为了研究镭同位素中八极集体的性质，利用亚势垒、多阶库仑激发的方法确定了^{222228}Ra核跃迁的电八极（E3）矩阵元素。放射性镭同位素的光束是由欧洲核子研究中心的he - isolde设备提供的。通过将^{222}Ra描述为具有稳定八极子变形的梨形，而将^{228}Ra描述为八极子振动子，可以解释不同核跃迁下E3矩阵元素的观测模式。

There is sparse direct experimental evidence that atomic nuclei can exhibit stable "pear" shapes arising from strong octupole correlations. In order to investigate the nature of octupole collectivity in radium isotopes, electric octupole (E3) matrix elements have been determined for transitions in ^{222,228}Ra nuclei using the method of sub-barrier, multistep Coulomb excitation. Beams of the radioactive radium isotopes were provided by the HIE-ISOLDE facility at CERN. The observed pattern of E3 matrix elements for different nuclear transitions is explained by describing ^{222}Ra as pear shaped with stable octupole deformation, while ^{228}Ra behaves like an octupole vibrator.

Evolution of Octupole Deformation in Radium Nuclei from Coulomb Excitation of Radioactive ^{222}Ra and ^{228}Ra Beams.

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