Ground-state band inSe72

Yrast states in ${}_{}{}^{72}{}_{}{}^{}\mathrm{Se}$ up to $I^{\pi }={14}^{+}$ have been excited in the reaction ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}({}_{}{}^{16}{}_{}{}^{}\mathrm{O}, 2p)$ at 40-58 MeV beam energy. Their mean lifetimes have been determined by using the Doppler shift attenuation method. The measured $B\left(E2\mathrm{}\right)\mathrm{}$ values of transitions within the ground-state band are discussed in terms of several nuclear models, including the triaxial rotor and interacting boson models. An upper limit of ${\tau }_f<0.1\mathrm{}$ ps was deduced for the feeding-time of the highest yrast states.