Quantal diffusion description of multinucleon transfers in heavy-ion collisions


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Ayik S., Yilmaz B., Yılmaz O. , Umar A. S.

PHYSICAL REVIEW C, cilt.97, 2018 (SCI İndekslerine Giren Dergi)

Özet

Employing the stochastic mean-field (SMF) approach, we develop a quantal diffusion description of the multi-nucleon transfer in heavy-ion collisions at finite impact parameters. The quantal transport coefficients are determined by the occupied single-particle wave functions of the time-dependent Hartree-Fock equations. As a result, the primary fragment mass and charge distribution functions are determined entirely in terms of the mean-field properties. This powerful description does not involve any adjustable parameter, includes the effects of shell structure, and is consistent with the fluctuation-dissipation theorem of the nonequilibrium statistical mechanics. As a first application of the approach, we analyze the fragment mass distribution in Ca-48 + U-238 collisions at the center-of-mass energy E-c.m. = 193 MeV and compare the calculations with the experimental data.