Evolution of quadrupole collectivity in N=80 isotones toward the Z=64 subshell gap: The B(E2;2+1→0+1) value of 142Sm
Stegmann, R., Bauer, C., Rainovski, G., Pietralla, N., Stahl, C., Bönig, S., . . . Witte, H. (2015). Evolution of quadrupole collectivity in N=80 isotones toward the Z=64 subshell gap: The B(E2;2+1→0+1) value of 142Sm. Physical Review C, 91 (5), 054326. doi:10.1103/PhysRevC.91.054326
Published inPhysical Review C
Warr, N. |
© the Authors. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License.
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 136Ba and 140Nd. To investigate this shell sensitivity toward the Z = 64 subshell gap, the B(E2; 2+ 1 → 0+ 1 ) value of the unstable nucleus 142Sm 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(1g7/2 2d5/2) subshell closure at Z = 64 with respect to a linear scaling of collectivity with valence proton number.