Excited states and reduced transition probabilities in Os168

Résumé fourni par la source

The level scheme of the neutron-deficient nuclide $^{168}\mathrm{Os}$ has been extended and mean lifetimes of excited states have been measured by the recoil distance Doppler-shift method using the JUROGAM $\ensuremath{\gamma}$-ray spectrometer in conjunction with the IKP K\"oln plunger device. The $^{168}\mathrm{Os}\phantom{\rule{4pt}{0ex}}\ensuremath{\gamma}$ rays were measured in delayed coincidence with recoiling fusion-evaporation residues detected at the focal plane of the RITU gas-filled separator. The ratio of reduced transition probabilities $B(E2;{4}_{1}^{+}\ensuremath{\rightarrow}{2}_{1}^{+})/B(E2;{2}_{1}^{+}\ensuremath{\rightarrow}{0}_{1}^{+})$ is measured to be 0.34(18), which is very unusual for collective band structures and cannot be reproduced by interacting boson model (IBM-2) calculations based on the SkM* energy-density functional.

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