Level structure ofSe69

Abstract
Excited levels in Se69 have been studied using the Ca40(S32,2pn)Se69 reaction at 95- and 105MeV beam energy. γ rays have been detected with the EUROBALL spectrometer operated in conjunction with the neutron wall and the charged-particle detector array EUCLIDES. New level sequences with positive and negative parities have been identified from nγγ and nγγγ coincidences. Spins have been assigned to many of the levels on the basis of angular distribution and directional correlation measurements. Excitation energies of the positive-parity yrast band and the branching ratios of its decay are compared with the predictions of the rigid triaxial rotor plus particle model.