Speaker
Prof.
Feng-Shou ZHANG
(College of Nuclear Science and Technology, Beijing Normal University)
Description
Constraining the neutron-proton effective mass splitting is important for
extracting the momentum dependencies of the symmetry energy. Within the
Boltzmann-Langevin transport model, in which the isospin and momentum-
dependent potential is incorporated, we investigate the neutron-proton
effective mass splitting in central 112;124;132Sn + 112;124;132Sn collisions at
50 MeV/u. It is found that the transverse momentum, rapidity, and kinetic
energy distributions of free neutron over proton ratio are sensitive to the
neutron-proton effective mass splitting, especially at higher transverse
momenta, at higher kinetic energies, and at larger rapidities. By taking the soft
density dependent symmetry energy with the neutron effective mass smaller
than that of proton, the calculated results on the double neutron over proton
ratios of final free nucleons can reproduce the MSU experimental data.
Primary author
Prof.
Feng-Shou ZHANG
(College of Nuclear Science and Technology, Beijing Normal University)
Co-author
Dr
Wenjie Xie
(College of Nuclear Science and Technology, Beijing Normal University)
