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Abstract: The energy and angular dependence of double differential cross sectionsd2sigma-dOmega dE were measured for p, d, t, 3,4,6He, 6,7,8Li, 7,9,10Be,10,11B, and C produced in collisions of 1.2, 1.9, and 2.5 GeV protons with a Nitarget. The shape of the spectra and angular distributions does almost notchange whereas the absolute value of the cross sections increases by a factorabout 1.7 for all ejectiles in this beam energy range. It was found that energyand angular dependencies of the cross sections cannot be reproduced by themicroscopic model of intranuclear cascade with coalescence of nucleons and thestatistical model for evaporation of particles from excited, equilibratedresidual nuclei. The inclusion of nonequilibrium processes, described by aphenomenological model of the emission from fast and hot moving sources,resulting from break-up of the target nucleus by impinging proton, leads tovery good reproduction of data. Cross sections of these processes are quitelarge, exhausting approximately half of the total production cross sections.Due to good reproduction of energy and angular dependencies of d2sigma-dOmegadE by model calculation it was possible to determine total production crosssections for all studied ejectiles. Results obtained in this work point to theanalogous reaction mechanism for proton induced reactions on Ni target as thatobserved previously for Au target in the same beam energy range.

Author: A.Budzanowski, M.Fidelus, D.Filges, F.Goldenbaum, H.Hodde, L.Jarczyk, B.Kamys, M.Kistryn, St.Kistryn, St.Kliczewski, A.Kowalczyk,


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