On nucleon exchange mechanism in heavy-ion collisions at near-barrier energies

Details On nucleon exchange mechanism in heavy-ion collisions at near-barrier energies On nucleon exchange mechanism in heavy-ion collisions at near-barrier energies

2011-05-10

arxiv.org/abs/1105.1946v1

Phys.Rev.C83:064615,2011

Physics

Nuclear Physics

Nuclear Theory

10 pages, 10 figures, submitted for publication

Scientific paper

10.1103/PhysRevC.83.064615

Nucleon drift and diffusion mechanisms in central collisions of asymmetric heavy-ions at near-barrier energies are investigated in the framework of a stochastic mean-field approach. Expressions for diffusion and drift coefficients for nucleon transfer deduced from the stochastic mean-field approach in the semiclassical approximation have similar forms familiar from the phenomenological nucleon exchange model. The variance of fragment mass distribution agrees with the empirical formula $\sigma^2_{AA}(t)= N_{\rm exc}(t)$. The comparison with the time-dependent Hartree-Fock calculations shows that, below barrier energies, the drift coefficient in the semiclassical approximation underestimates the mean number of nucleon transfer obtained in the quantal framework. Motion of the window in the dinuclear system has a significant effect on the nucleon transfer in asymmetric collisions.

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