Projectile fragment emission in fragmentation of $^{56}$Fe on C, Al,and CH$_{2}$ targets at 471 A MeV

Abstract

The emission angle and the transverse momentum distributions of projectile fragments produced in fragmentation of $^{56}$Fe on CH$_{2}$, C, and Al targets at 471 A MeV are measured. It is found that for the same target the average value and width of angular distribution decrease with increase of the projectile fragment charge, and for the same projectile fragment the average value of the distribution increases and the width of the distribution decreases with increasing the target charge number. The transverse momentum distribution of projectile fragment can be explained by a single Gaussian distribution and the averaged transverse momentum per nucleon decreases with the increase of the charge of projectile fragment. The cumulated squared transverse momentum distribution of projectile fragment can be well explained by a single Rayleigh distribution. The temperature parameter of emission source of projectile fragment, calculated from the cumulated squared transverse momentum distribution, decreases with the increase of the size of projectile fragment.