Abstract
We report on the first in-beam study of high spin levels in83Y which were established up to 9.0 MeV excitation energy and probable spin of 41/2+ resp. 27/2− by means of the reaction58Ni(28Si, 3p). Ten lifetimes and six lifetime limits in the 10−12–10−9 s range were determined in two recoil distance Doppler shift experiments. The positive parity yrast states form ag 9/2 Coriolis decoupled band with partial alignment, near-rigid rotor moment of inertia and deformationβ 2=0.29. The negative parity yrast band has very similar collective properties; it shows a pronounced band crossing at rotational frequency ħω≈0.40 MeV which we associate with twoquasiparticleg 9/2 proton alignment. At 2.56 MeV excitation, a second ΔI=1 band starting with 17/2− was found. On the basis of the similarity to85Y and the very weakE2 decay of this state, we suggest that this band has (3qp) configuration with an alignedg 9/2 neutron pair. The lifetimes of the lowest 2+ and 4+ state in84Zr populated in the reaction58Ni (28Si, 2p) were determined to be τ(2)=17.8(11) ps resp. τ(4)=3.5(4) ps.
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Work partially supported by Deutsches Bundesministerium für Forschung und Technologie under contract 06GÖ456 and by grants from the U.K. Science and Engineering Research Council
The authors would like to thank the crews of the tandem accelerators of the Brookhaven Laboratory and Oxford University for providing excellent28Si beams. The help of J. Billowes, A.A. Chishti and B. Wörmann during the recoil distance experiment is very much appreciated. This research has been partially funded by the Deutsches Bundesministerium für Forschung und Technologie under contract 06 GÖ 456 and by grants from the U.K. Science and Engineering Council.