New Features of Shape Coexistence in 152Sm

被引：56

作者：

Garrett, P. E. ^{[1
]}

Kulp, W. D. ^{[2
]}

Wood, J. L. ^{[2
]}

Bandyopadhyay, D. ^{[3
]}

Choudry, S. ^{[3
]}

Dashdorj, D. ^{[4
]}

Lesher, S. R. ^{[3
]}

McEllistrem, M. T. ^{[3
]}

Mynk, M. ^{[3
]}

Orce, J. N. ^{[3
]}

Yates, S. W. ^{[3
]}

机构：

[1] Univ Guelph, Dept Phys, Guelph, ON N1G 2W1, Canada

[2] Georgia Inst Technol, Dept Phys, Atlanta, GA 30332 USA

[3] Univ Kentucky, Lexington, KY 40506 USA

[4] N Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 06期

基金：

加拿大自然科学与工程研究理事会; 美国国家科学基金会;

关键词：

EVEN DEFORMED NUCLEI; PHASE COEXISTENCE; OCTUPOLE STATES; TRANSITIONS; BANDS;

D O I：

10.1103/PhysRevLett.103.062501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Excited states in Sm-152 have been investigated with the Sm-152(n,n(')gamma) reaction. The lowest four negative-parity band structures have been characterized in detail with respect to their absolute decay properties. Specifically, a new K-pi=0(-) band has been assigned with its 1(-) band head at 1681 keV. This newly observed band has a remarkable similarity in its E1 transition rates for decay to the first excited K-pi=0(+) band at 684 keV to the lowest K-pi=0(-) band and its decay to the ground-state band. Based on these decay properties, as well as energy considerations, this new band is assigned as a K-pi=0(-) octupole excitation based on the K-pi=0(2)(+) state. An emerging pattern of repeating excitations built on the 0(2)(+) level similar to those built on the ground state may indicate that Sm-152 is a complex example of shape coexistence rather than a critical point nucleus.

引用

页数：4

共 50 条

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