Inelastic Neutron Scattering inF19

Abstract

The energies and yields of the $\gamma$ rays following inelastic neutron scattering in ${\mathrm{F}}^{19}$ have been studied as a function of neutron bombarding energy up to 2.2 Mev. In this range four $\gamma$ rays only, of energies 111±1.5 kev, 196±2 kev, 1.240±0.015 Mev and 1.371±0.016 Mev, have been found. The first two correspond to the first two excited states of ${\mathrm{F}}^{19}$. The second pair of $\gamma$ rays appear, from the threshold curves, to arise from ${\mathrm{F}}^{19}$ levels at 1.43±0.03 and 1.55±0.03 Mev respectively. The alternative of a 1.35-Mev level and the decay scheme are discussed.