The spectral continua En30 MeV of neutrons from the reactions Al27, Zr90, Pb208(p,xn) have been measured for Ep=120 and 160 MeV and angles 0°145°. Angular distributions can be explained quantitatively in absolute values and shapes over five orders of magnitude as statistical multistep direct emission in which up to six steps are involved with significant contributions. The strength V0 of the effective nucleon-nucleon interaction applied shows a systematic dependence on the projectile energy Ep160 MeV that is consistent with that of spectroscopic factors for single step distorted-wave Born approximation results for transitions to low-lying states. The data also agree well with predictions of a recent phenomenological parametrization.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Nuclear and High Energy Physics