Direct Lifetime Measurements of the Excited States in 72Ni

被引：20

作者：

Kolos, K. ^{[1
,2
]}

Miller, D. ^{[3
]}

Grzywacz, R. ^{[1
,4
]}

Iwasaki, H. ^{[5
,6
]}

Al-Shudifat, M. ^{[1
]}

Bazin, D. ^{[5
]}

Bingham, C. R. ^{[1
,4
]}

Braunroth, T. ^{[7
]}

Cerizza, G. ^{[1
]}

Gade, A. ^{[5
,6
]}

Lemasson, A. ^{[5
]}

Liddick, S. N. ^{[5
,8
]}

Madurga, M. ^{[1
]}

Morse, C. ^{[5
,6
]}

Portillo, M. ^{[5
]}

Rajabali, M. M. ^{[3
]}

Recchia, F. ^{[5
]}

Riedinger, L. L. ^{[1
,4
]}

Voss, P. ^{[9
]}

Walters, W. B. ^{[10
]}

Weisshaar, D. ^{[5
]}

Whitmore, K. ^{[5
,6
]}

Wimmer, K. ^{[11
]}

Tostevin, J. A. ^{[12
]}

机构：

[1] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[2] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA

[3] TRIUMF, 4004 Westbrook Mall, Vancouver, BC V6T 2A3, Canada

[4] Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA

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

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

[7] Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany

[8] Michigan State Univ, Dept Chem, E Lansing, MI 48824 USA

[9] Simon Fraser Univ, Burnaby, BC V5A 1S6, Canada

[10] Univ Maryland, College Pk, MD 20742 USA

[11] Cent Michigan Univ, Dept Phys, Mt Pleasant, MI 48859 USA

[12] Univ Surrey, Dept Phys, Guildford GU2 7XH, Surrey, England

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 116卷 / 12期

基金：

美国国家科学基金会;

关键词：

ISOMERS; NUCLEI; TOOL;

D O I：

10.1103/PhysRevLett.116.122502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The lifetimes of the first excited 2(+) and 4(+) states in Ni-72 were measured at the National Superconducting Cyclotron Laboratory with the recoil-distance Doppler-shift method, a model-independent probe to obtain the reduced transition probability. Excited states in Ni-72 were populated by the one-proton knockout reaction of an intermediate energy Cu-73 beam. gamma-ray-recoil coincidences were detected with the gamma-ray tracking array GRETINA and the S800 spectrograph. Our results provide evidence of enhanced transition probability B(E2; 2(+) -> 0(+)) as compared to Ni-68, but do not confirm the trend of large B(E2) values reported in the neighboring isotope Ni-70 obtained from Coulomb excitation measurement. The results are compared to shell model calculations. The lifetime obtained for the excited 4(1)(+) state is consistent with models showing decay of a seniority nu = 4, 4(+) state, which is consistent with the disappearance of the 8(+) isomer in Ni-72.

引用

页数：5

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