Effects of symmetry energy and momentum dependent interaction on low-energy reaction mechanisms

TL;DR

This paper investigates how the symmetry energy and momentum dependence of nuclear interactions influence low-energy nuclear reaction mechanisms, specifically the dipole responses in neutron-rich nuclei, using a microscopic transport model.

Contribution

It introduces a detailed analysis of the effects of momentum-dependent interactions on dipole resonances in neutron-rich nuclei within a microscopic transport framework.

Findings

Peak energies of PDR and IVGDR shift higher with momentum-dependent interactions.

Calculated resonance energies align closely with experimental data.

Results are consistent with Hartree-Fock RPA calculations.

Abstract

We study the dipole response associated with the Pygmy Dipole Resonance (PDR) and the Isovector Giant Dipole Resonance (IVGDR), in connection with specific properties of the nuclear effective interaction (symmetry energy and momentum dependence), in the neutron-rich systems $^{68}$Ni, $^{132}$Sn and $^{208}$Pb. We perform our investigation within a microscopic transport model based on the Landau-Vlasov kinetic equation. We observe that the peak energies of PDR and IVGDR are shifted to higher values when employing momentum dependent interactions, with respect to the results obtained neglecting momentum dependence. The calculated energies are close to the experimental values and similar to the results obtained in Hartree-Fock (HF) with Random Phase Approximation (RPA) calculations.