Cross section measurements for $\gamma$-rays emitted in $^{103}$Rh($n, x n y p z a \gamma$) reactions

Although rhodium is a useful radiochemical diagnostic of integrated neutron fluence, no thorough study of the $\gamma$ rays emitted in fast neutron-induced reactions on the one-and-only stable rhodium isotope has been performed. Absolute partial cross sections for production of discrete $\gamma$-rays using $^{103}$Rh($n, x n y p z \alpha \gamma$) reactions with $x \leq 7$ and $y,z \leq 1$ in a total of 15 reaction channels were measured in the present work. The data were taken using the GEANIE spectrometer comprised of 26 high-purity Ge detectors with 20 BGO escape-suppression shields. The broad-spectrum pulsed neutron beam of the Los Alamos Neutron Science Center's (LANSCE) WNR facility provided neutrons in the energy range from 0.2 to 300~MeV. The time-of-flight technique was used to determine the incident neutron energies. Partial $\gamma$-ray cross sections have been measured for a total of 140 transitions and for neutron energies 0.8~MeV$< E_{n} <$300~MeV. An estimate of the population of isomers in the ($n,n^{\prime}$), ($n,2n$) and ($n,3n$) channels was attempted. Theoretical calculations up to $E_{n} = 20$~MeV from the GNASH reaction model are compared to the experimental results.