Abstract
Neutron emission in the fusion process is investigated based on the Langevin equations coupled with the procedures describing the emission of neutron for the reaction systems $^{48}\mathrm{Ca}$ + $^{238}U$ and $^{50}\mathrm{Ti}$ + $^{249}\mathrm{Cf}$. The precompound neutron multiplicity ${n}_{pc}$, defined as the average number of neutron per fusion event, is obtained by means of those dynamic calculations. Influence of precompound neutron emission on the formation of superheavy elements is examined by means of the dynamic calculations using two different approaches, i.e., with and without taking the neutron emission into account in the fusion process. Our results show that the precompound neutron emission enhances the formation cross sections of superheavy nuclei. The origin responsible for the enhancement is that the precompound neutron emission increases the survival probability of the evaporation residue and hence increases the relevant cross sections.
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