Production of neutron-rich nuclei near N=126 in multinucleon transfer reactions with potential pockets

The quasifission rate is improved by the harmonic oscillator approximation for the interaction potential at the barrier and pocket. Within the framework of the DNS model, the calculated production cross sections are in good agreement with the experimental data in 64Ni + 208Pb reaction. The dependence of the cross sections on the isospin of the reaction partner is studied. The cross sections of neutron-rich isotopes in the reaction with the reaction partner having the highest N/Z ratio are the largest, because of the lowest difference of potential energy surface and driving potential. As the scattering angle is smaller than the smaller rainbow angle, the differential cross section of the fragment decreases sharply, because of the much smaller partial cross section at a lower angular momentum. The angular distribution shifts to a larger angle at a higher incident energy. The angular distribution of the unknown isotopes near N = 126 in 70Ni + 202Pt reaction is located at 75 degrees-150 degrees and peaks at about 80 degrees.