Abstract

By using a new reaction model for light nuclei, thedouble-differential cross section of total outgoing neutron with LUNF codefor n + 16O reactions at En = 14.1 MeV and 18 MeV have beencalculated and analyzed. In this paper the opened reaction channels,which have contribution to emitting the neutrons, are listed in detail.To improve the fitting results the direct inelastic scattering mechanismis involved. The calculating results agree fairly well with theexperimental data at En = 14.1 MeV and the deviation from calculatedresults and experimental data in low energy region at En = 18 MeV hasbeen analyzed. Since the possibility of 5He has been affirmedtheoretically [J.S. Zhang, Sci. Chin. G 47 (2004) 137],so 5He emission from n + 16O reaction is taken into account,which plays an important role at the region of the outgoing neutronenergy εn < 3 MeV in total outgoing neutron energy-angularspectrum. The calculated results indicatethat the pre-equilibrium mechanism dominates the whole reaction processes,and the recoil effect in light nuclear reactions is essentially important.

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