Quadrupole moment of the8−isomer inSb112

Abstract

The quadrupole interaction of the ${8}^{\ensuremath{-}}$ isomeric state (${T}_{\frac{1}{2}}=536$ 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 ${8}^{\ensuremath{-}}$ state of $^{112}\mathrm{Sb}$ in Sb, the quadrupole moment was obtained relative to the moment of the stable ground state of $^{121}\mathrm{Sb}$: $|\frac{Q(^{112}\mathrm{Sb}, {8}^{\ensuremath{-}})}{Q(^{121}\mathrm{Sb}, {\frac{5}{2}}^{+})}|=1.958(10)$. 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 $^{103}\mathrm{Rh}(^{12}\mathrm{C}, 3n)^{112}\mathrm{Sb}$, $E=50$ MeV, pulsed beam, recoil implantation into Sb single crystal, Sn single crystal, In; measured ${I}_{\ensuremath{\gamma}}(\ensuremath{\theta}, t)$ quadrupole modulation; deduced $Q$.