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

The quadrupole moments of the isomeric ({π}h9/2{ν}i13/2^-1) configurations in 202,204,206,207Bi 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 ²⁰⁶Bi is corrected.