Ni58(n, p)Co58m,gCross Section and Isomer Ratio from 1.04 to 2.67 MeV

The cross sections and isomer ratios for the ${\mathrm{Ni}}^{58}(n, p){\mathrm{Co}}^{58m,g}$ reaction have been measured relative to the ${\mathrm{U}}^{235}(n, f)$ reaction for neutron energies of 1.04 to 2.67 MeV. The absolute yield of ${\mathrm{Co}}^{58}$ was determined by counting coincidences between the 0.800-MeV $\gamma$ ray and the annihilation radiation of the positrons from the decay of the ${\mathrm{Co}}^{58}$ ground state. The observed cross sections and isomer ratios are compared with calculated values obtained by assuming compound nucleus formation and proton emission only to the 5+ and 2+ states of ${\mathrm{Co}}^{58}$.