Band structures in sup(118,120)Te

The level schemes of sup(118-120)Te were investigated using Sn(α, 2nγ)Te reactions and employing standard γ-ray spectroscopic techniques. Definite spin and parity assignments could be made for many newly found levels. The excited states can be classified into two categories. Collective quadrupole excitations on the ground states are compared with results of calculations which are performed with the IBA-2 model. High spin proton and neutron quasi particle excitations are interpreted within the framework of the one-broken-pair model. Although it is apparent that configuration mixing is non-negligible at spins Jsup(π) >= 68, excitation energies of many levels are well accounted for either by the IBA-2 calculations or by the quasiparticle calculation. Several states have been excited belonging to bands based upon the quasiparticle states. Branching and mixing ratios of the depopulating γ-rays agree with this interpretation. (orig.)