Abstract
High spin states of126Ba have been populated via the116Sn (13C, 3n) reaction and were investigated by inbeam gamma-ray spectroscopy. Partially NaJ (Tl)-BGO anti-compton shields were used. Two positive parity band crossings were established. The yrast band was observed up to a tentative 18+ level. The gamma-bands and two band structures of negative parity were found. In addition a tentative 3− state has been seen. Two-quasiparticle Routhians are constructed from the one-quasiparticle Routhians of the bands in the odd neighbouring isotopes and isotones and are compared to the ones observed in126Ba. This leads to ah 11/2 g 7/2-neutron structure of the strongly coupled negative parity bands and a two-quasiproton structure of the decoupled bands of negative parity. The branching and mixing ratios for the neutron bands are analyzed.
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We are indebted to G. Hagemann, B. Herskind and J. Westergaard for their help to perform the experiments at the Niels Bohr Institut in Risø. We would like to thank J.D. Garrett, R.M. Lieder and W. Gast for most enlightening discussions. We want to thank G. LoBianco for this valuable advice in setting up the anticompton shields. This work has been funded by the German Federal Minister for Research and Technology (BMFT) under the contract number 060K 272.