The quadrupole interaction of the $8^{-}$ isomeric state ($T_{\frac{1}{2}}=536\mathrm{}$ ns) in ${}_{}{}^{112}{}_{}{}^{}\mathrm{Sb}$ has been measured using the time differential perturbed angular distribution method. The linear momentum transfer from the ${}_{}{}^{103}{}_{}{}^{}\mathrm{Rh}({}_{}{}^{12}{}_{}{}^{}\mathrm{C}, 3n)$ reaction recoiled the isomeric nuclei into single crystals of Sb and Sn and a polycrystalline In foil. From the quadrupole coupling constant for the $8^{-}$ state of ${}_{}{}^{112}{}_{}{}^{}\mathrm{Sb}$ in Sb, the quadrupole moment was obtained relative to the moment of the stable ground state of ${}_{}{}^{121}{}_{}{}^{}\mathrm{Sb}$: $\left|\frac{Q({}_{}{}^{112}{}_{}{}^{}\mathrm{Sb}, 8^{-})}{Q({}_{}{}^{121}{}_{}{}^{}\mathrm{Sb}, {\frac{5}{2}}^{+})}\mathrm{}\right|=1.958\left(10\mathrm{}\right)\mathrm{}$. The value is in accordance with the description of the isomer as an odd proton coupled to a neutron-excited Sn core. In addition, the measured coupling constants in Sn and In allow the determination of the quadrupole moments of isomers in ${}_{}{}^{120,122}{}_{}{}^{}\mathrm{Sb}$ and ${}_{}{}^{115}{}_{}{}^{}\mathrm{Sb}$.

NUCLEAR REACTIONS ${}_{}{}^{103}{}_{}{}^{}\mathrm{Rh}({}_{}{}^{12}{}_{}{}^{}\mathrm{C}, 3n){}_{}{}^{112}{}_{}{}^{}\mathrm{Sb}$, $E=50\mathrm{}$ MeV, pulsed beam, recoil implantation into Sb single crystal, Sn single crystal, In; measured $I_{\gamma }(\theta , t)$ quadrupole modulation; deduced $Q$.

• Received 22 December 1981

DOI:https://doi.org/10.1103/PhysRevC.26.493