Nuclear Structure ofSc43. I. Energy Levels and Decay Schemes

The ${\mathrm{Ca}}^{42}(p, \gamma ){\mathrm{Sc}}^{43}$ reaction has been studied in the range $E_p=1200-2060\mathrm{}$ keV in order to determine the properties of the excited states in ${\mathrm{Sc}}^{43}$. Approximately 100 resonances due to this reaction were identified and located in proton energy to an accuracy of ±2 keV. Singles spectra were obtained at each of the resonances at $E_p=1235, 1242, 1423, 1808, 1891, \mathrm{and} 2037$ keV using a large-volume Ge(Li) detector. These spectra were used to derive consistent $\gamma$-ray decay schemes and accurate level energies for the resonant and bound states of ${\mathrm{Sc}}^{43}$. A new level in ${\mathrm{Sc}}^{43}$ at 4.455 MeV was found. In addition, new results or results significantly different from earlier reports were obtained for the decay properties of most levels below 4 MeV in ${\mathrm{Sc}}^{43}$. We also obtained a new value of $Q=4.929\mathrm{}\pm 0.002$ MeV for the ${\mathrm{Ca}}^{42}(p, \gamma ){\mathrm{Sc}}^{43}$ reaction. The resonance strengths were measured relative to the known strength of the $E_p=1842\mathrm{}$-keV resonance in the ${\mathrm{Ca}}^{40}(p, \gamma ){\mathrm{Sc}}^{41}$ reaction.