Effect of shell structure in the fusion reactions

The fusion reactions are studied in the central collisions Se-82 + Ba-134 and Se-82 + Ba-138 by the improved isospin-dependent quantum molecular-dynamics model, where the nucleus Ba-138 has a closed neutron shell N = 82. Comparing the shell correction energies and fusion probabilities of these two reactions with the ones of other asymmetric or more symmetric reaction systems that form the same compound nuclei, we find the dependence of the fusion reaction on the nuclear shell structure of the colliding nuclei. The experimental data of the fusion probabilities are described well by the present model. The result suggests that the neutron shell closure N = 82 promotes fusion.