Approaching the neutron-rich heavy and superheavy nuclei by multinucleon transfer reactions with radioactive isotopes

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.PACS number(s): 25.70. Jj, 25.60.Pj

Production of neutron-rich heavy nuclei around N = 162 in multinucleon transfer reactions

“…The neutron shell closure around N=126 is favorable for enhancing the cross sections of neutron-rich isotopes and extensive investigation in the MNT reactions with the DNS model [54,57]. The shell effect enhances the fission barrier and enlarges the separation energy of the MNT fragment.…”

Production mechanism of neutron-deficient actinide isotopes in complete fusion reactions and multinucleon transfer reactions

“…Recently, a renew interest, the damped collisions of two heavy nuclei were investigated and motivated for producing heavy isotopes, in particular for new nuclides close to proton and neutron-rich drip lines. The DNS model can nicely reproduce the production cross sections of fusion-evaporation products and MNT yields [45][46][47][48][49][50][51]. The fragment yields in the MNT reactions are related to the emission angle in the laboratory system.…”

“…We use a deflection function method to evaluate the fragment angle which is related to the mass of fragment, angular momentum and incident energy. The deflection angle is composed of the Coulomb and nuclear interaction [41,50]. Shown in figure 4 is the PLF and TLF angular distributions of primary fragments within transferring 20 nucleons in the reaction of 105 Sn + 238 U at the laboratory incident energy of E lab = 6 MeV/nucleon.…”

Rare Isotope Formation in Complete Fusion and Multinucleon Transfer Reactions in Collisions of 48Ca +248Cm around Coulomb Barrier Energies

“…Following the motivation for predicting exotic heavy and superheavy nuclei, several models have been developed, such as the dynamical model based on multidimensional Langevin equations [22,23], the time-dependent Hartree-Fock (TDHF) approach [24][25][26][27], the GRAZING model [28,29], the improved quantum molecular dynamics (ImQMD) model [30,31], the Langevin-type dynam-ical equations [32,33], and the dinuclear system (DNS) model [34][35][36][37][38][39], etc. Some interesting issues of synthesis mechanism, total kinetic energy spectra, structure effect have been stressed.…”