Abstract
High spin states in85Y have been excited in the reaction72Ge(16O,p2n) at 48–60 MeV beam energy. From measurements ofnγ andγγ coincidences, excitation functions and angular distributions, the high spin spectrum of85Y has been established up to 5.4 MeV excitation energy and spinI≦29/2. Lifetimes or limits of lifetimes have been determined for 14 levels via the recoil distance and Doppler shift attenuation method. Theg 9/2 decoupled proton band is found to backbend atI π=17/2+ as also seen in the reduction of the 17/2+→13/2+ and 21/2+→17/2+ E2 transition strengths. The lowest (3qp) positive parity band has predominantly aν 2 g 9/2×πg 9/2 structure. The observed negative parity yrast states in the spin range 15/2−≦I≦29/2− are most probably of (g 9/2)2 ×(f 5/2,p 1/2) (3qp) nature as suggested by a comparison of the84Sr and85Y level structures and electromagnetic transition strengths.
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Supported by Deutsches Bundesministerium für Forschung und Technologie
The authors are grateful to the crew of the Cologne tandem accelerator for their help and to Peter von Bretano for his interest in this study.