Abstract
High spin states in {sup 139}Nd nucleus have been reinvestigated with the reaction {sup 128}Te ({sup 16}O, 5n) at a beam energy of 90 MeV. The level scheme has been expanded with spin up to 47/2({Dirac_h}/2{pi}). At low spin, the yrast collective structure built on the {nu}h{sub 11/2}{sup -1} multiplet shows a triaxial shape with {gamma}{approx_equal}32 deg. according to calculations of the triaxial rotor-plus-particle model. The configurations for some high spin states have been discussed from a systematic comparison with neighboring nuclei. Three collective oblate bands with {gamma}{approx}-60 deg. at high spin were identified for the first time. A band crossing is observed around ({Dirac_h}/2{pi}){omega}{approx}0.4 MeV in one oblate band based on the 25/2{sup -} level. The characteristics for these oblate bands have been discussed.
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