• Open Access

Evolution of quadrupole collectivity in N=80 isotones toward the Z=64 subshell gap: The B(E2;21+01+) value of Sm142

R. Stegmann et al.
Phys. Rev. C 91, 054326 – Published 26 May 2015

Abstract

It was shown that the evolution of the B(E2;21+01+) values in N = 80 isotones from Te to Nd is affected by the underlying subshell structure. This manifests itself in the observation of the local suppression of the B(E2) value at Z=58 with respect to the neighboring nuclei Ba136 and Nd140. To investigate this shell sensitivity toward the Z=64 subshell gap, the B(E2;21+01+) value of the unstable nucleus Sm142 was measured utilizing the projectile Coulomb excitation technique. The radioactive ion beam (RIB) experiment was performed at the REX-ISOLDE facility at CERN. The B(E2) value of 32(4)W.u. reflects the impact of the π(1g7/22d5/2) subshell closure at Z=64 with respect to a linear scaling of collectivity with valence proton number.

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  • Received 29 April 2014
  • Revised 1 April 2015

DOI:https://doi.org/10.1103/PhysRevC.91.054326

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

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Vol. 91, Iss. 5 — May 2015

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