ROTATIONAL BAND STRUCTURES IN CS-127 - SHAPE CHANGES INDUCED BY H11/2 NEUTRON ALIGNMENT

被引：49

作者：

LIANG, Y ^{[1
]}

MA, R ^{[1
]}

PAUL, ES ^{[1
]}

XU, N ^{[1
]}

FOSSAN, DB ^{[1
]}

WYSS, RA ^{[1
]}

机构：

[1] MANNE SIEGBAHN INST PHYS, S-10405 STOCKHOLM 50, SWEDEN

来源：

PHYSICAL REVIEW C | 1990年 / 42卷 / 03期

关键词：

D O I：

10.1103/PhysRevC.42.890

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Several rotational bands have been populated to high spin in Cs127 following the Sn120(11B,4n) reaction. Rotational bands built on low-lying proton g7/2, d5/2, and g9/2 (hole) orbitals, and the unique-parity h11/2 orbital were observed and identified. For the g9/2 (hole) case, both signatures were seen in a strongly coupled I=1 band, while for the other cases, decoupled I=2 bands were observed with strong in-band quadrupole transitions. Through comparisons with cranked-shell-model calculations, these band structures are understood to be associated with a prolate (0°) deformed nuclear shape. At frequencies above Latin small letter h with stroke=0.3 MeV, the rotational alignment of a pair of h11/2 neutrons was observed for each of the h11/2, g7/2, and d5/2 bands. This neutron alignment is predicted to drive the nuclear core away from a prolate shape towards the collectively rotating oblate (=-60°) shape. Changes in the measured signature splittings for the bands below and above the alignment are consistent with the shape changes. © 1990 The American Physical Society.

引用

页码：890 / 901

页数：12

共 30 条

[1] NUCLEAR SHELL STRUCTURE AT VERY HIGH ANGULAR-MOMENTUM [J].