Level scheme of 116Sb from (p,n gamma ) reaction.

Abstract

The \ensuremath{\gamma}-ray and internal conversion electron spectra of the $^{116}\mathrm{Sn}$(p,n\ensuremath{\gamma}${)}^{116}$Sb reaction have been measured at ${\mathit{E}}_{\mathit{p}}$=6.3, 6.7, and 7.2 MeV bombarding energies with Ge(HP), Ge(HP,LEPS) \ensuremath{\gamma} and superconducting magnetic lens plus Si(Li) electron spectrometers. The energies and relative intensities of 90 $^{116}\mathrm{Sb}$ \ensuremath{\gamma} rays, as well as internal conversion coefficients of 21 $^{116}\mathrm{Sb}$ transitions have been determined. Angular distribution data have been obtained for 37 \ensuremath{\gamma} rays. A more complete level scheme of $^{116}\mathrm{Sb}$ has been deduced, which contains 38 levels below 1500 keV excitation energy. Multipolarities of transitions and \ensuremath{\gamma}-ray branching ratios have been deduced. Calculated Hauser-Feshbach (p,n) cross sections have been compared with experimental values. Level spins and parities have been determined on the basis of the Hauser-Feshbach analysis, internal conversion coefficients, and \ensuremath{\gamma}-ray angular distribution data. The energies of several $^{116}\mathrm{Sb}$ proton-neutron multiplets have been calculated using the parabolic rule. Members of different multiplets have been identified.