The thermal cross sections and resonance integrals have been determined for radiative neutron capture by ${}^{112,116,122,124}\mathrm{Sn}$ leading to the ground and isomeric states of ${}^{113,123,125}\mathrm{Sn}$ and the isomeric state of ${}^{117}\mathrm{Sn}$. Using natural samples of Sn metal foils and high-resolution $\gamma$-ray spectroscopy, it was possible to determine a mutually consistent set of cross sections, particularly the small thermal cross sections leading to $11/2^{-}$ states. A detailed analysis of the $\gamma$-ray emissions from irradiated Sn samples enabled us to make new and more precise determinations of the energies and intensities of $\gamma$ rays emitted in the decays of 40-min ${}^{123m}\mathrm{Sn}$ and 9.5-min ${}^{125m}\mathrm{Sn}$ and corresponding adjustments to the energy levels of ${}^{123,125}$Sb. The present results support the recently adopted revised value for the branching ratio of the 255.1-keV $\gamma$ ray in the decay of ${}^{113}\mathrm{Sn}$. The presence of a ${}^{116m}\mathrm{In}$ impurity in our samples prompted a new determination of the energies and intensities of the $\gamma$ rays emitted in its decay and of the energy levels in ${}^{116}\mathrm{Sn}$.

• Received 3 January 2006

DOI:https://doi.org/10.1103/PhysRevC.73.054312