Study of Isotopic Distribution of the Projectile-like Fragments Produced in the ^17,18N + ¹⁹⁷Au Reactions at 33MeV/u

The experimental data of the isotopic distribution for projectile-like fragments are presented for the ^17,18N + ¹⁹⁷Au reaction at 33MeV/u. The width of the isotopic distributions for ¹⁸N projectile is significantly broader than that for ¹⁷N projectile, and the average N/Z ratio of the former shifts to higher neutron number side. As long as the realistic nucleon density distribution is used, the isotopic distribution for fragments is reproduced by the simple abrasion-ablation model calculation, which thus provides an independent way to determine the surface distribution of the nuclear matter density for neutron-rich nuclei.