BAND CROSSING OBSERVED IN NEUTRON-RICH PD ISOTOPES VIA SPONTANEOUS FISSION OF CF-252

High spin excited states in neutron-rich nuclei Pd-112, Pd-114, Pd-116 have been investigated by measuring prompt gamma rays emitted from a Cf-252 spontaneous fission source. Two different measurements were per formed. First, gamma-gamma coincidence data, necessary to determine th e decay schemes, were obtained by using an array of 20 Compton-suppres sed Ge detectors. Second, Z identification and the enhancement of a de sired neutron channel were carried out using a x-n-gamma multiplicity spectrometer. Ground state bands have been extended to J(pi) = 10+ for 112Pd, and J(pi) = 12+ for 114Pd and 116Pd. Band crossings were obser ved in all three isotopes. It was found from cranked shell model calcu lations that these backbends are due to the alignment of two g9/2 prot ons. The measured energy levels were also compared with predictions of the interacting boson model.