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., Ilieva, S., Blazhev, A., Damyanova, A., Danchev, M., Gladnishki, K., Jolie, J., Lutter, R., Pakarinen, J., Radeck, D., Rapisarda, E., Reiter, P., Scheck, M., Siebeck, B., . . . De 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), Article 054326. https://doi.org/10.1103/PhysRevC.91.054326
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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.
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