On the irregularities in the band structures of78Kr

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Abstract
Using in-beam gamma -ray spectroscopy techniques experimental information on the presence of two-quasiparticle components in the band structures of 78Kr has been derived. The observation of a second 10+ state decaying by a fast M1 transition of B(M1, 102+ to 101+)=0.8(4) Wu to the 10+ yrast level gives strong evidence for a band crossing between the collective ground-state band and a two-quasiparticle band. The residual interaction between these configurations has been estimated to be V(10+)=130+or-10 keV. The configuration mixing also provides an explanation for the decrease of the B(E2) values in the yrast sequence above the 8+ level.