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

TL;DR

This paper uses the dinuclear system model to predict the production of unknown neutron-deficient actinide isotopes through fusion-evaporation and multinucleon transfer reactions, providing cross sections and decay characteristics.

Contribution

It introduces a comprehensive model incorporating dynamical deformation and statistical methods to predict yields of new neutron-deficient actinide isotopes in various nuclear reactions.

Findings

Fusion-evaporation reactions are more favorable for producing new neutron-deficient actinides.

Charge particle channels dominate decay processes of proton-rich nuclides.

Fragment energies and angles depend strongly on collision orientation.

Abstract

Within the dinuclear system model, unknown neutron-deficient isotopes Np, Pu, Am, Cm, Bk, Cf, Es, Fm are investigated in $^{40}$Ca, $^{36,40}$Ar, $^{32}$S, $^{28}$Si,$^{24}$Mg induced fusion-evaporation reactions and multinucleon transfer reactions with radioactive beams $^{59}$Cu,$^{69}$As,$^{90}$Nb,$^{91}$Tc, $^{94}$Rh, $^{105,110}$Sn, $^{118}$Xe induced with $^{238}$U near Coulomb barrier energies. The production cross sections of compound nuclei in the fusion-evaporation reactions and fragments yields in the multinucleon transfer reactions are calculated within the model. A statistical approach is used to evaluate the survival probability of excited nuclei via the both reaction mechanisms. A dynamical deformation is implemented into the model in the dissipation process. It is found that charge particle channels (alpha and proton) dominate in the decay process of proton-rich nuclides and the fusion-evaporation reactions are favorable to produce the new neutron-deficient actinide isotopes. The total kinetic energies and angular spectra of primary fragments are strongly dependent on colliding orientations.