Coulomb excitation paths of high-K isomer bands in 178Hf.

摘要: Three distinctly different mechanisms are shown to populate the ${K}^{\ensuremath{\pi}}={6}^{+}$ (${t}_{1/2}=77\text{ }\text{ }\mathrm{n}\mathrm{s}$), ${16}^{+}$ (31 yr), and ${8}^{\ensuremath{-}}$ (4 s) isomer bands of $^{\mathrm{178}}\mathrm{H}\mathrm{f}$ by Coulomb excitation. High spin states three were populated excitation a hafnium target with 650 MeV $^{\mathrm{136}}\mathrm{X}\mathrm{e}$ beam. Although direct population high-$K$ is highly $K$-forbidden, in up spins ${13}_{K=6}^{+}$, ${20}_{K=16}^{+}$, ${14}_{K=8}^{\ensuremath{-}}$ in-band $\ensuremath{\gamma}$ yields $\ensuremath{\sim}{10}^{\ensuremath{-}4}$ ground state band. The data consistent rapid increase $K$ mixing increasing bands.