In-beam gamma-ray spectroscopy ofSe74following theNi60(O16,2p),Ni64(C12,2n) andCu65(B11,2n) reactions

The energy levels in ${}_{}{}^{74}{}_{}{}^{}\mathrm{Se}$ produced in the ${}_{}{}^{60}{}_{}{}^{}\mathrm{Ni}$(${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$,$2p$), ${}_{}{}^{64}{}_{}{}^{}\mathrm{Ni}$(${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$,$2n$) and ${}_{}{}^{65}{}_{}{}^{}\mathrm{Cu}$(${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$,$2n$) reactions were studied. An energy level scheme was deduced from $\gamma -\gamma$ coincidence measurements. Spin and parity assignments based on angular distribution and directional correlation of oriented nuclei measurements were made for most of the levels. Lifetimes of many of the transitions in ${}_{}{}^{74}{}_{}{}^{}\mathrm{Se}$ were deduced from their Doppler broadened lineshapes via the Doppler shift attenuation method. Three "rotational-like" band structures to high spin were observed and their properties investigated. A positive parity, $\Delta J=1\mathrm{}$, band to ($9^{+}$) as well as the positive parity, $\Delta J=2\mathrm{}$, yrast band to (${14}^{+}$) were observed. In addition a negative parity, $\Delta J=2\mathrm{}$, band with rotational-like character was seen to (${13}^{-}$).