Quadrupole collectivity in neutron-deficient Sn nuclei: 104Sn and the role of proton excitations

被引：64

作者：

Bader, V. M. ^{[1
,2
]}

Gade, A. ^{[1
,2
]}

Weisshaar, D. ^{[1
,2
]}

Brown, B. A. ^{[1
,2
]}

Baugher, T. ^{[1
,2
]}

Bazin, D. ^{[1
]}

Berryman, J. S. ^{[1
]}

Ekstrom, A. ^{[1
,3
,4
]}

Hjorth-Jensen, M. ^{[1
,2
,3
,4
]}

Stroberg, S. R. ^{[1
,2
]}

Walters, W. B. ^{[5
]}

Wimmer, K. ^{[1
,6
]}

Winkler, R. ^{[1
]}

机构：

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

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

[3] Univ Oslo, Dept Phys, N-0316 Oslo, Norway

[4] Univ Oslo, Ctr Math Applicat, N-0316 Oslo, Norway

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

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

来源：

PHYSICAL REVIEW C | 2013年 / 88卷 / 05期

基金：

美国国家科学基金会;

关键词：

STATES; PARAMETRIZATION; SPECTROSCOPY; BANDS;

D O I：

10.1103/PhysRevC.88.051301

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：

We report on the experimental study of quadrupole collectivity in the neutron-deficient nucleus Sn-104 using intermediate-energy Coulomb excitation. The B(E2; 0(1)(+). -> 2(1)(+)) value for the excitation of the first 2(+) state in Sn-104 has been measured to be 0.180(37) e(2)b(2) relative to the well-known B(E2) value of Cd-102. This result disagrees by more than one sigma with a recently published measurement [G. Guastalla et al., Phys. Rev. Lett. 110, 172501 (2013)]. Our result indicates that the most modern many-body calculations remain unable to describe the enhanced collectivity below midshell in Sn approaching N = Z = 50. We attribute the enhanced collectivity to proton particle-hole configurations beyond the necessarily limited shell-model spaces and suggest the asymmetry of the B(E2)-value trend around midshell to originate from enhanced proton excitations across Z = 50 as N = Z is approached.

引用

页数：5

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