A new isomeric state has been identified at 302.2 keV excitation in ${}^{86}\mathrm{Y}$ populated by the ${}^{86}\mathrm{Sr}\mathrm{}(p,n),$ ${}^{86}\mathrm{Sr}\mathrm{}(d,2n),$ and ${}^{85}\mathrm{Rb}{(}^3\mathrm{He},2n)$ reactions at the energies $E_p=14\mathrm{}$ MeV, $E_d=13.5\mathrm{}$ MeV, and $E_{{}^3\mathrm{He}}=30\mathrm{}$ MeV. The decay scheme was investigated by pulsed-beam $\gamma$-ray spectroscopy. Its g factor was measured by the time-differential perturbed angular distribution method in external magnetic field. The isomer properties $T_{1/2}=125\mathrm{}$ ns, $J^{\pi }{=7\mathrm{}}^{-},$ and $g=-0.083\left(3\right)\mathrm{}$ were determined. The transition strength and the g factor indicate a superposition of single-particle and collective contributions. The g factor $g=+0.542\mathrm{}\left(9\right)\mathrm{}$ has been determined for the ${5/2}^{-}\hspace{0.5em}266.3$ keV 178 ns isomeric state in ${}^{85}\mathrm{Y}.$

• Received 3 April 2000

DOI:https://doi.org/10.1103/PhysRevC.62.014306