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

V. M. Bader, A. Gade, D. Weisshaar, B. A. Brown, T. Baugher, D. Bazin, J. S. Berryman, A. Ekström, M. Hjorth-Jensen, S. R. Stroberg, W. B. Walters, K. Wimmer, and R. Winkler
Phys. Rev. C 88, 051301(R) – Published 4 November 2013

Abstract

We report on the experimental study of quadrupole collectivity in the neutron-deficient nucleus 104Sn using intermediate-energy Coulomb excitation. The B(E2;01+21+) value for the excitation of the first 2+ state in 104Sn has been measured to be 0.180(37)e2b2 relative to the well-known B(E2) value of 102Cd. 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.

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  • Received 1 July 2013

DOI:https://doi.org/10.1103/PhysRevC.88.051301

©2013 American Physical Society

Authors & Affiliations

V. M. Bader1,2, A. Gade1,2, D. Weisshaar1,2, B. A. Brown1,2, T. Baugher1,2, D. Bazin1, J. S. Berryman1, A. Ekström1,3, M. Hjorth-Jensen1,2,3, S. R. Stroberg1,2, W. B. Walters4, K. Wimmer1,5, and R. Winkler1,*

  • 1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
  • 2Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
  • 3Department of Physics and Center of Mathematics for Applications, University of Oslo, N-0316 Oslo, Norway
  • 4Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
  • 5Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA

  • *Present address: Los Alamos National Laboratory, Los Alamos, NM 87545, USA.

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Issue

Vol. 88, Iss. 5 — November 2013

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