To reach neutron-rich heavy and superheavy nuclei by multinucleon transfer reactions with radioactive isotopes

TL;DR

This paper investigates multinucleon transfer reactions using the DNS model to produce neutron-rich heavy and superheavy nuclei, analyzing reaction dynamics, energy spectra, and fragment distributions near Coulomb barrier energies.

Contribution

It introduces a detailed analysis of multinucleon transfer mechanisms with radioactive isotopes using the DNS model, focusing on production cross sections and energy spectra of neutron-rich nuclei.

Findings

Primary fragment kinetic energies are dissipated from relative motion and rotation.

Fragments are predominantly formed in the forward angle domain.

Neutron-rich isotope production is enhanced near shell closures.

Abstract

The dynamical mechanism of multinucleon transfer (MNT) reactions has been investigated within the dinuclear system (DNS) model, in which the sequential nucleon transfer is described by solving a set of microscopically derived master equations. Production cross sections, total kinetic energy spectra, angular distribution of formed fragments in the reactions of $^{124,132}$Sn+ $^{238}$U/$^{248}$Cm near Coulomb barrier energies are thoroughly analyzed. It is found that the total kinetic energies of primary fragments are dissipated from the relative motion energy and rotational energy of the two colliding nuclei. The fragments are formed in the forward angle domain. The energy dependence of the angular spectra is different between projectile-like and target-like fragments. Isospin equilibrium is governed under the potential energy surface. The production cross sections of neutron-rich isotopes are enhanced around the shell closure.