Neutron-Induced Charged Particle Reactions in Potassium-39

Thin thallium-activated potassium iodide crystals were exposed to monoenergetic neutrons ranging in energy from 2.0 to 5.5 Mev. Pulse-height spectra were taken of the scintillations in the crystal. Five charged particle groups were observed, three ($n, p$) reactions leading to states in A³⁹, and two (n, α) reactions leading to states in Cl³⁶. A new level was discovered at 2.46±{}0.1 Mev in A³⁹, and the level at about 1.25 Mev in A³⁹ confirmed. Yield curves were measured for three of the groups.