Quadrupole collectivity in neutron-rich Cd isotopes

In this contribution, nuclear structure studies with post-accelerated radioactive beams of the neutron-rich isotopes $^{122,123,124,126,128}$Cd from the REX-ISOLDE facility at CERN are presented. The method employed is ($\gamma$)-ray spectroscopy with the MINIBALL array following “safe” Coulomb excitation. For the even isotopes, the (B(E2;0$^+ \to 2^+$)) values, as a common trend, are larger than predictions from state-of-the-art shell model calculations, but agree well with beyond-mean-field calculations. No striking evidence for a considerable deformation has been found. For $^{123}Cd, studied as first odd radioactive Cd isotope in the same way, the level scheme had to be revised.