Identification of neutron h_11/2bands in^121,123Cd

Abstract

New excited states built on the 11/2− isomeric states are identified in neutron-rich 121,123Cd, respectively, with gammasphere by measuring three-and higher-fold prompt coincidences following the spontaneous fission of 252Cf. The new data suggests that the 11/2− isomers in the odd-A Cd isotopes with N ≥ 75 have spherical shape similar to those in Te. It is suggested that the backbending observed at ℏω ≈ 0.445 MeV in 121Cd is because of the alignment of the h11/2 neutron pair.