Production of Ca61, Sc63, Ti65,

Projectile fragmentation provides an method to produce the unknown neutron-rich isotopes. In this work, the isospin-dependent Boltzmann-Langevin equation is employed to investigate the influence of projectiles on the fragments production. The cross sections of fragments with proton number $Z=20$--27 are calculated under the reaction systems $^{81,84,86}\mathrm{Ga}+^{9}\mathrm{Be}$. The obtained results suggest that the radioactive projectile $^{86}\mathrm{Ga}$ is favorable to the yields of neutron-rich nuclei. The newly produced isotopes $^{61}\mathrm{Ca}, ^{63}\mathrm{Sc}, ^{65}\mathrm{Ti}, ^{68,69}\mathrm{V}, ^{71}\mathrm{Cr}, ^{77}\mathrm{Fe}$, and $^{79}\mathrm{Co}$, whose cross sections are characterized by the order of 1 to 100 $\ensuremath{\mu}\mathrm{b}$, can be observed in the reaction $^{86}\mathrm{Ga}+^{9}\mathrm{Be}$ at $1A$ GeV. This means the production cross sections of neutron-rich nuclei are very highly sensitive to the neutron-proton excess of projectile.