Beyond mean-field approach to heavy-ion reactions around the Coulomb barrier

¹ PNTPM, CP229, Université Libre de Bruxelles, 1050 Bruxelles, Belgium
² GANIL, BP55027, 14076 Caen, France
³ Physics Department, Tennessee Technological University, Cookeville, Tennessee 38505, USA
⁴ Physics Department, Ankara University, Tandogan 06100, Ankara, Turkey

^a e-mail: kouhei.washiyama@ulb.ac.be

Abstract

Dissipation and fluctuations of one-body observables in heavy-ion reactions around the Coulomb barrier are investigated with a microscopic stochastic mean-field approach. By projecting the stochastic meanfield dynamics on a suitable collective path, transport coefficients associated with the relative distance between colliding nuclei and a fragment mass are extracted. Although microscopic mean-field approach is know to underestimate the variance of fragment mass distribution, the description of the variance is much improved by the stochastic mean-field method. While fluctuations are consistent with the empirical (semiclassical) analysis of the experimental data, concerning mean values of macroscopic variables the semiclassical description breaks down below the Coulomb barrier.