Decay scheme and transition probabilities ofRb85

Abstract

The decay scheme of 'Rb up to 2A MeV excitation energy was investigated by the Kr{p,y) reaction and Coulomb excitation with alpha particles. Singles and y-y coincidence spectra were recorded. Doppler shift attenuation measurements in gas were performed using the same gas as stopper medium. Lifetimes or lifetime limits were determined for 20 levels by Coulomb excitation and the Doppler shift attenuation method. An existing ambiguity referring to the lifetime of the second excited level has been removed. NUCLEAR REACTIONSKr (p, y), Coulomb excitation by alpha bombardment. E~=1.85 -2.87 MeV. E =3 MeV. Natural Kr gas target; p =0.1 -106X 10 Pa. Doppler shift attenuation in gas. Measured: level energies, branching ratios, decay scheme, lifetimes.

Yrast transition strengths in85Rb and85Sr

“…States with 3 qp structure in BaRb and 85Rb have indeed been proposed by Gast et al [7] and Zell et al [8] to occur above 2.4 MeV excitation energy. Low lying negative parity states in 85Rb observed in/~-decay and proton capture studies [9,10] have been explained with fair success in terms of the cluster vibrational model with 3 qp coupling. Electromagnetic transition strengths are among the most sensitive experimental quantities to test the nature of the core-particle coupling and elucidate changes of deformation or seniority.…”