title: Spallation neutron emission spectra in medium and heavy target nuclei by a proton beam up to 140 MeV energy.
abstract: In this study, neutron-emission spectra produced by (p,xn) reactions for some spallation neutron target nuclei such as (65)Cu, (204,206,207,208)Pb, (209)Bi, (232)Th and (238)U have been calculated by a proton beam up to 140 MeV. Multiple pre-equilibrium mean free path constants from internal transition for (204,208)Pb (p, xn) neutron emission spectra have been investigated. In the calculations, pre-equilibrium effects were calculated by using new evaluated hybrid model and geometry dependent hybrid model, full exciton model and cascade exciton model. The reaction equilibrium component was calculated by Weisskopf-Ewing model. The obtained results have been discussed and compared with the available experimental data and found agreement with each other.
authors.affiliation: Faculty of Arts and Sciences, Süleyman Demirel University, 32260 Isparta, Turkey. kaplan@fef.sdu.edu.tr
authors.forename: A
authors.initials: A
authors.lastname: Kaplan
authors.forename: E
authors.initials: E
authors.lastname: Tel
authors.forename: E G
authors.initials: EG
authors.lastname: Aydin
authors.forename: A
authors.initials: A
authors.lastname: Aydin
authors.forename: M
authors.initials: M
authors.lastname: Yilmaz