Quadrupole moments of high-spin isomers in neutron-deficient Bi isotopes

The quadrupole moments of the isomeric (π${\mathit{h}}_{9/2}$ν${\mathit{i}}_{13/2}^{\mathrm{-}1}$) configurations in ${}_{}{}^{202,204,206,207}{}_{}{}^{}\mathrm{Bi}$ are measured by the level-mixing-spectroscopy method. They are very small, but show a large relative increase as more neutrons are removed from the closed N=126 shell. In addition, the temperature-dependent electric-field gradient and relaxation time of BiTl are measured. The multipolarity mixing of the 675 keV in ${}_{}{}^{206}{}_{}{}^{}\mathrm{Bi}$ is corrected.