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

It was shown that the evolution of the 𝐵⁡(𝐸⁢2;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⁡(𝐸⁢2) value at 𝑍=58 with respect to the neighboring nuclei
136
Ba
and
140
Nd
. To investigate this shell sensitivity toward the 𝑍=64 subshell gap, the 𝐵⁡(𝐸⁢2;2+
1→0+
1) value of the unstable nucleus
142
Sm
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⁡(𝐸⁢2) value of 32⁢(4)⁢W.u. reflects the impact of the 𝜋⁡(1⁢𝑔7/2⁡2⁢𝑑5/2) subshell closure at 𝑍=64 with respect to a linear scaling of collectivity with valence proton number.

Authors: R. Stegmann, C. Bauer, G. Rainovski, N. Pietralla, C. Stahl, S. Bönig, 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. Stora, P. Thöle, T. Thomas, M. Thürauf, M. J. Vermeulen, D. Voulot, N. Warr, F. Wenander, V. Werner, H. De Witte

Doi: 10.1103/PhysRevC.91.054326

Issue number:

Journal: Phys. Rev. C

Page number: 054326

Published on: 2015-05-26

Year: