Role of the νg9/2 orbital in the development of collectivity in the A ≈ 60 region: The case of 61Co

被引：11

作者：

Ayangeakaa, A. D. ^{[1
]}

Zhu, S. ^{[1
]}

Janssens, R. V. F. ^{[1
]}

Carpenter, M. P. ^{[1
]}

Albers, M. ^{[1
]}

Alcorta, M. ^{[1
]}

Baugher, T. ^{[2
,3
]}

Bertone, P. F. ^{[1
]}

Chiara, C. J. ^{[1
,4
]}

Chowdhury, P. ^{[5
]}

David, H. M. ^{[1
]}

Deacon, A. N. ^{[6
]}

DiGiovine, B. ^{[1
]}

Gade, A. ^{[2
,3
]}

Hoffman, C. R. ^{[1
]}

Kondev, F. G. ^{[7
]}

Lauritsen, T. ^{[1
]}

Lister, C. J. ^{[1
]}

McCutchan, E. A. ^{[1
]}

Moerland, D. S. ^{[1
,8
]}

Nair, C. ^{[1
]}

Rogers, A. M. ^{[1
]}

Seweryniak, D. ^{[1
]}

机构：

[1] Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA

[2] Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA

[3] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

[4] Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA

[5] Univ Massachusetts, Dept Phys, Lowell, MA 01854 USA

[6] Univ Manchester, Schuster Lab, Sch Phys & Astron, Manchester M13 9PL, Lancs, England

[7] Argonne Natl Lab, Nucl Engn Div, Argonne, IL 60439 USA

[8] Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA

来源：

PHYSICAL REVIEW C | 2015年 / 91卷 / 04期

基金：

英国科学技术设施理事会; 美国国家科学基金会;

关键词：

SHEARS MECHANISM; SHELL-MODEL; MAGNETIC ROTATION; NUCLEI; BANDS; LIFETIMES; STATES; DECAY;

D O I：

10.1103/PhysRevC.91.044327

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：

An extensive study of the level structure of Co-61 has been performed following the complex Mg-26(Ca-48, 2 alpha 4np gamma)Co-61 reaction at beam energies of 275, 290, and 320 MeV using Gammasphere and the Fragment Mass Analyzer (FMA). The low-spin structure is discussed within the framework of shell-model calculations using the GXPF1A effective interaction. Two quasirotational bands consisting of stretched-E2 transitions have been established up to spins I = 41/2 and (43/2), and excitation energies of similar to 17 and similar to 20 MeV, respectively. These are interpreted as signature partners built on a neutron nu(g(9/2))(2) configuration coupled to a proton pi p(3/2) state, based on cranked shell model (CSM) calculations and comparisons with observations in neighboring nuclei. In addition, four Delta I = 1 bands were populated to high spin, with the yrast dipole band interpreted as a possible candidate for the shears mechanism, a process seldom observed thus far in this mass region.

引用

页数：15

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