Negative Parity Bands and Signature Splitting Inversion in80Rb

Abstract

High spin states in 80Rb were studied via the 65Cu+19F,66Zn+18O and 68Zn+16O reactions. The 75-MeV19F, 76-MeV 18O and 80-MeV 16O beams were provided by theCIAE HI-13 Tandem accelerator and the JAERI Tandem accelerator. The promptγ-γ coincidence and the directional correlation from orientednuclei (DCO) were measured by the detector arrays in CIAE and JAERI.Twenty-three new states with 28 new transitions have been assigned to80Rb. The states were observed up to spins of 20+ and 22− in theα = 0 branch for the positive and negative parity yrast bandsrespectively. The negative parity non-yrast bands were significantlyextended up to spins of 22− and 15−. The band crossingswith frequencies 0.51 MeV and 0.61 MeV in the α = 0 cascade were observed forthe first time. The signature splitting was observed in bothnegative parity bands. The signature inversions at spins of about7 ℏ and 15 ℏ were observed.