Cross sections have been measured for the emission of protons, deuterons, and alpha particles for 15-MeV neutrons on ${}_{}{}^{54,56}{}_{}{}^{}\mathrm{Fe}$, ${}_{}{}^{58,60}{}_{}{}^{}\mathrm{Ni}$, ${}_{}{}^{50,52}{}_{}{}^{}\mathrm{Cr}$, and ${}_{}{}^{63,65}{}_{}{}^{}\mathrm{Cu}$, as well as on natural iron, nickel, and chromium. A quadrupole spectrometer served to detect particles with energies as low as 1 MeV. For some of the targets, a substantial fraction of the charged-particle spectrum is at energies below the Coulomb barrier. Cross sections and spectra are compared with statistical and pre-equilibrium model predictions.

NUCLEAR REACTIONS ${}_{}{}^{50,52}{}_{}{}^{}\mathrm{Cr}$, Cr, ${}_{}{}^{54,56}{}_{}{}^{}\mathrm{Fe}$, Fe, ${}_{}{}^{58,60}{}_{}{}^{}\mathrm{Ni}$, Ni, ${}_{}{}^{63,65}{}_{}{}^{}\mathrm{Cu}$, ($n$,$p$), ($n$,$d$), ($n$,$\alpha$), $E=14.8\mathrm{}$ MeV; measured $\sigma (E_p,\theta )$, ($E_d$, $\theta$), ($E_{\alpha }$, $\theta$), enriched and natural targets. Hauser-Feshbach analysis, deduced reaction mechanism.

• Received 31 October 1978

DOI:https://doi.org/10.1103/PhysRevC.19.2127