(p, p′) and (p, α) Reactions fromK39

Abstract

In the region of excitation up to 5.3 Mev, sixteen excited states in ${\mathrm{K}}^{39}$ have been observed by means of inelastic scattering of protons from natural potassium. An electrostatic accelerator was used as a source of protons, the inelastically scattered protons were analyzed at several angles with a magnetic spectrograph, and the incident beam energies were between 7 and 7.5 Mev. The first excited state in ${\mathrm{K}}^{39}$ is at 2.526 Mev. Two groups of alpha particles from the reaction ${\mathrm{K}}^{39}(p, \alpha ){\mathrm{A}}^{36}$ were also observed. The $Q$ values for these groups are 1.286±0.007 Mev and -0.691±0.010 Mev, corresponding to the ground-state transition and to a level in ${\mathrm{A}}^{36}$ at 1.977±0.008 Mev.