Excited states of ${}^{112}$Sb were investigated through the ${}^{112}$Sn$(p,n\gamma )$${}^{112}$Sb reaction. $\gamma$-ray, $\gamma \gamma$-coincidence, and internal conversion electron spectra were measured with Ge(HP) $\gamma$ and superconducting magnetic lens plus Si(Li) electron spectrometers at 8.5, 8.9, 9.1, and 9.3 MeV bombarding proton energies. A significantly extended level scheme was constructed. Spins and parities have been assigned to the levels from Hauser-Feshbach analysis of reaction cross sections, internal conversion coefficients, angular distribution of the $\gamma$ rays, and decay properties of the states. The low lying states were assigned to proton-neutron multiplets on the basis of their decay properties. The energy splitting of these multiplets have been calculated using the parabolic rule.

• Received 6 December 1996

DOI:https://doi.org/10.1103/PhysRevC.55.2244