Seniority, collectivity, and B(E2) enhancement in 72Ni

被引：32

作者：

Chiara, C. J. ^{[1
,2
]}

Walters, W. B. ^{[1
]}

Stefanescu, I. ^{[1
,2
]}

Alcorta, M. ^{[2
]}

Carpenter, M. P. ^{[2
]}

Fornal, B. ^{[3
]}

Guerdal, G. ^{[4
]}

Hoffman, C. R. ^{[2
]}

Janssens, R. V. F. ^{[2
]}

Kay, B. P. ^{[2
]}

Kondev, F. G. ^{[4
]}

Krolas, W. ^{[3
,5
]}

Lauritsen, T. ^{[2
]}

Lister, C. J. ^{[2
]}

McCutchan, E. A. ^{[2
]}

Pawlat, T. ^{[3
]}

Rogers, A. M. ^{[2
]}

Seweryniak, D. ^{[2
]}

Sharp, N. ^{[1
]}

Wrzesinski, J. ^{[3
]}

Zhu, S. ^{[2
]}

机构：

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

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

[3] Niewodniczanski Inst Nucl Phys PAN, PL-31342 Krakow, Poland

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

[5] Joint Inst Heavy Ion Res, Oak Ridge, TN 37831 USA

来源：

PHYSICAL REVIEW C | 2011年 / 84卷 / 03期

关键词：

NEUTRON-RICH NUCLEI; MU-S-ISOMERS; ISOTOPES; STATES;

D O I：

10.1103/PhysRevC.84.037304

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：

Gamma rays assigned to Ni-72(28)44 have been identified with Gammasphere in deep-inelastic reactions involving a 450-MeV Ge-76 beam and a Pt-198 target. Using a combination of spectra produced by double gates on the known 454-, 843-, and 1095-keV members of the ground-state cascade, a coincident line at 199 keV has been identified and is tentatively assigned as the 8(+) -> 6(+) transition. These gamma-ray coincidences have been observed only in prompt events, indicating an 8(+) half-life below 20 ns and requiring a large B(E2) enhancement compared to that expected from a seniority scheme. This value is consistent with models showing decay to a seniority nu = 4, 6(+) level that is depressed by the same two-body interaction responsible for the rather low 1095-keV 2(1)(+) energy, as compared to the valence-symmetry counterpart Ru-94(44)50.

引用

页数：4

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