Production mechanism of neutron-deficient actinide isotopes in complete fusion reactions and multinucleon transfer reactions
Abstract
Within the dinuclear system model, unknown neutron-deficient isotopes Np, Pu, Am, Cm, Bk, Cf, Es, Fm are investigated in 40Ca, 36,40Ar, 32S, 28Si,24Mg induced fusion-evaporation reactions and multinucleon transfer reactions with radioactive beams 59Cu,69As,90Nb,91Tc, 94Rh, 105,110Sn, 118Xe induced with 238U 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.
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