TRANSITION STRENGTHS AND NEW BAND STRUCTURES IN ODD-ODD RB-78

High-spin states in Rb-78 were studied using the Fe-54(Si-28,3pn) reac tion at 120 MeV and the Ni-58(Na-23,2pn) reaction at 65 and 70 MeV. Pr ompt and delayed gamma-gamma coincidences were measured using the Pitt -FSU detector array. Results from these experiments have led to new le vels partly grouped into new bands, new spin-parity assignments, and a rearrangement of the low-lying portion of the level scheme. States we re observed up to (19(+)) and (15(-)) in the lowest energy positive- a nd negative-parity bands. Spin assignments were based on both directio nal correlation of oriented nuclei ratios and angular distributions. F or some low-lying levels parity assignments were supported by a measur ement of the linear polarizations of gamma rays. Lifetimes were determ ined using the Doppler-shift attenuation method and direct timing. A r eversal of signature splitting was observed in the yrast band at the 1 0(+) state. Large alterations were seen in the B(M1) strengths in the yrast band, while the B(E2) values in the two most strongly populated bands show a considerable collective enhancement.