Pre-equilibrium effects in charge-asymmetric low-energy reactions

• Published in: Physics Letters B
• Main Authors: H. Zheng, S. Burrello, M. Colonna, V. Baran
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier 2017
• Subjects: Low-energy nuclear reactions; Pre-equilibrium effects; Dynamical dipole; Symmetry energy; Physics; QC1-999; sami
• Online Access: https://doi.org/10.1016/j.physletb.2017.04.002; https://doaj.org/article/41e1cffda8c246e58544fc69d3ff4151

We study the pre-equilibrium dipole response in the charge-asymmetric reaction Sn132+Ni58 at Elab=10 MeV/A, within a semi-classical transport model employing effective interactions for the nuclear mean-field. In particular, we adopt the recently introduced SAMi-J Skyrme interactions, whose parameters are specifically tuned to improve the description of spin–isospin properties of nuclei. Within the same framework, we also discuss pre-equilibrium nucleon emission. Our results show that both mechanisms, i.e., pre-equilibrium dipole oscillations and nucleon emission, are sensitive to the symmetry energy below the saturation density ρ0 (in the range 0.6ρ0−ρ0), to the momentum dependence of the mean-field potential and to the nucleon–nucleon cross section. Finally, a correlation analysis is applied to examine the impact of the model parameters on observables of experimental interest.