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Observation of mutually enhanced collectivity in self-conjugate 3876Sr38

A. Lemasson, H. Iwasaki, C. Morse, D. Bazin, T. Baugher, J. S. Berryman, A. Dewald, C. Fransen, A. Gade, S. McDaniel, A. Nichols, A. Ratkiewicz, S. Stroberg, P. Voss, R. Wadsworth, D. Weisshaar, K. Wimmer, and R. Winkler
Phys. Rev. C 85, 041303(R) – Published 19 April 2012

Abstract

The lifetimes of the first 2+ states in the neutron-deficient 76,78Sr isotopes were measured using a unique combination of the γ-ray line-shape method and two-step nucleon exchange reactions at intermediate energies. The transition rates for the 2+ states were determined to be B(E2;2+0+)=2220(270) e2fm4 for 76Sr and 1800(250) e2fm4 for 78Sr, corresponding to large deformation of β2 = 0.45(3) for 76Sr and 0.40(3) for 78Sr. The present data provide experimental evidence for mutually enhanced collectivity that occurs at N = Z = 38. The systematic behavior of the excitation energies and B(E2) values indicates a signature of shape coexistence in 76Sr, characterizing 76Sr as one of most deformed nuclei with an unusually reduced E(4+)/E(2+) ratio.

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  • Received 7 October 2011

DOI:https://doi.org/10.1103/PhysRevC.85.041303

©2012 American Physical Society

Authors & Affiliations

A. Lemasson1, H. Iwasaki1,2, C. Morse1,2, D. Bazin1, T. Baugher1,2, J. S. Berryman1, A. Dewald3, C. Fransen3, A. Gade1,2, S. McDaniel1,2, A. Nichols4, A. Ratkiewicz1,2, S. Stroberg1,2, P. Voss1,2,5, R. Wadsworth4, D. Weisshaar1, K. Wimmer1, 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
  • 3Institut für Kernphysik der Universität zu Köln, D-50937 Köln, Germany
  • 4Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom
  • 5Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6

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Issue

Vol. 85, Iss. 4 — April 2012

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