Evolution of quadrupole collectivity in N=80 isotones toward the Z=64 subshell gap: The B(E2; 2(1)(+) -> 0(1)(+)) value of Sm-142

R. Stegmann, C. Bauer, G. Rainovski, N. Pietralla, C. Stahl, S. Boenig, S. Ilieva, A. Blazhev, A. Damyanova, M. Danchev, K. Gladnishki, J. Jolie, R. Lutter, J. Pakarinen, D. Radeck, E. Rapisarda, P. Reiter, M. Scheck, B. Siebeck, T. StoraP. Thoele, T. Thomas, M. Thurauf, M. J. Vermeulen, D. Voulot, N. Warr, F. Wenander, V. Werner, H. De Witte

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Abstract

It was shown that the evolution of the B(E2; 2(1)(+) -> 0(1)(+)) 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 Ba-136 and Nd-140. To investigate this shell sensitivity toward the Z = 64 subshell gap, the B(E2; 2(1)(+) -> 0(1)(+))) value of the unstable nucleus Sm-142 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 pi(1g(7/2) 2d(5/2)) subshell closure at Z = 64 with respect to a linear scaling of collectivity with valence proton number.
Original languageEnglish
Article number054326
JournalPhysical Review C
Volume91
Issue number5
DOIs
Publication statusPublished - 26 May 2015
Externally publishedYes

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