Nanosecond isomers in $sup 186$W

The levels of $sup 186$W fed in the $beta$-decay of $sup 186$Ta and EC decay of $sup 186$Re were investigated. The single spectrum and the delayed coincidence spectra were measured. The half-lives of three isomers in $sup 186$W were determined: Tsub(1/2)(1222.3 keV)=1.036+-0.010ns, Tsub(1/2) (952.4 keV)=0.193+-0.015ns, Tsub(1/2) (1661keV)=4.92+-0.10ns and the upper limit of the 1463 keV level half-life Tsub(1/2)<=0.1 ns was estimated. Two-quasiparticle excitations were calculated and their assignment to experimentally observed states is proposed. (FR)