Prolate-oblate shape coexistence in Kr-75

Abstract The collective bands of 75Kr were extended up to spin 45 2 using the compound reactions 50Cr(28Si,2pn), 54Fe(24Mg,2pn) and 58Ni(20Ne,2pn)75Kr. Lifetimes were measured by RDDS with nine OSIRIS detectors in coincidence. Mixing ratios were determined by measurements of internal conversion coefficients, angular distribution and correlations. Deviations between different measurements are explained by the short lifetimes leading to angle dependent intensity losses due to Doppler shift. Spins and parities were assigned from angular distributions, excitation functions and DCO ratios measured with the OSIRIS_12 spectrometer. The band head spin of the negative parity yrast band was establish…