Transition strengths and new band structures in odd-oddRb78

摘要: High-spin states in $^{78}\mathrm{Rb}$ were studied using the $^{54}\mathrm{Fe}$${(}^{28}$Si,3pn) reaction at 120 MeV and $^{58}\mathrm{Ni}$${(}^{23}$Na,2pn) 65 70 MeV. Prompt delayed \ensuremath{\gamma}-\ensuremath{\gamma} coincidences measured Pitt-FSU detector array. Results from these experiments have led to new levels partly grouped into bands, spin-parity assignments, a rearrangement of low-lying portion level scheme. States observed up (${19}^{+}$) (${15}^{\mathrm{\ensuremath{-}}}$) lowest energy positive- negative-parity bands. Spin assignments based on both directional correlation oriented nuclei ratios angular distributions. For some parity supported by measurement linear polarizations \ensuremath{\gamma} rays. Lifetimes determined Doppler-shift attenuation method direct timing. A reversal signature splitting was yrast band ${10}^{+}$ state. Large alternations seen B(M1) strengths band, while B(E2) values two most strongly populated bands show considerable collective enhancement. \textcopyright{} 1996 The American Physical Society.