Precompound analyses ofNi58−64(n, px)reactions

Data for the inclusive (n, $\mathrm{p}x$) reaction for 60 MeV neutrons on ${}_{}{}^{58,60,62,64}{}_{}{}^{}\mathrm{Ni}$ are presented. Angular distributions for $Q$-value bins show a decrease of the forward peaking of the proton emission with increasing neutron excess. A marked dependence of the angle integrated spectra on ($N-Z$) is observed. The data are compared to hybrid and geometry dependent hybrid model calculations. Although these results predict the general shape of the spectra, they do not account for ($N-Z$) dependence. A neutron skin, as given by a hydrodynamic model, is added to the geometry dependent hybrid model, which predicts a higher precompound decay for high impact parameters. These results agree much better with the $N-Z$ dependence of the data.