Energy Levels in the NucleusMn56

Abstract

The energy distribution of the protons emitted in the reaction ${\mathrm{Mn}}^{55}\mathrm{}(d,p)\mathrm{}{\mathrm{Mn}}^{56}$ has been studied by an absorption method. For excitations up to 4.38 Mev above the ground state of the ${\mathrm{Mn}}^{56}$ nucleus, the protons are found to fall into six distinct energy groups, corresponding to excited states at 1.07, 1.77, 2.48, 3.61, and 4.38 Mev above ground. Results are also presented which indicate that the yields of the individual proton groups vary slowly with deuteron energy, showing no sharp resonance effects. From the $Q$-value for the most energetic proton group the mass of the nucleus ${\mathrm{Mn}}^{55}$ has been computed to be 54.9634±.0022 mass units.