Cross-section measurements for (n,xn) reactions by in-beam gamma-ray spectroscopy

Abstract

The nuclear reactions 207 Pb(n,2n) 206 Pb and 232 Th(n,5n) 228 Th were studied by measuring prompt gamma-ray emission spectra from the interaction of neutrons with an enriched 207 Pb sample and a nat Th sample. For 207 Pb the measurements were performed at the white neutron beam of the GELINA neutron source at IRMM Geel in the neutron energy range up to 20 MeV. The Th measurements were done at the quasi-monoenergetic 7 Li(p,n) 7 Be neutron source at the Université Catholique de Louvain for five peak neutron energies in the range 29 MeV to 42 MeV. The measurements were complemented by model calculations using the code system EMPIRE-II. © 2005 American Institute of Physics.