Intermediate mass fragment emission pattern in peripheral heavy-ion collisons at Fermi energies

The emission pattern in the vperp−vpar plane of intermediate mass fragments with Z=3–7 (IMF) has been studied in the collision 116Sn+93Nb at 29.5AMeV as a function of the total kinetic energy loss of the reaction. This pattern shows that for peripheral reactions most IMF’s are emitted at velocities intermediate between those of the projectile- and target-like products. Coulomb trajectory calculations show that these IMF’s are produced in the interaction zone in a short time interval at the end of the target-projectile interaction.