Measurements of $\gamma$ rays from the ${}_{}{}^{19}{}_{}{}^{}\mathrm{F}(n,n^{\prime }\gamma )$ reaction have been performed with 0.2-1.7-MeV incident neutrons. The measured 110- and 197-keV level excitation functions, magnetic substate populations, and $\gamma$-ray angular distributions are generally consistent with compound-nuclear calculations. Although the experimental values of the 197-keV level excitation function are also consistent with a 15% direct-interaction component, the corresponding magnetic substate populations and 197-keV $\gamma$-ray angular distributions are not sensitive to this component.

[NUCLEAR REACTIONS ${}_{}{}^{19}{}_{}{}^{}\mathrm{F}(n,n^{\prime }\gamma )$, $E=0.2-1.7\mathrm{}$ MeV; measured $\sigma \mathrm{}\left(E\right)\mathrm{}$, $\sigma (E=1.3\mathrm{}$ MeV,$\theta$); deduced magnetic substate populations, calculated $\sigma (E,\theta )$, magnetic substate populations; DWBA and CN analysis.]

• Received 13 September 1973

DOI:https://doi.org/10.1103/PhysRevC.9.527