Projectile fragment emission in the fragmentation of ~(56)Fe on C,Al and CH_2 targets at 471 A MeV

The emission angle and the transverse momentum distributions of projectile fragments produced in the fragmentation of~(56)Fe on CH_2,C and Al targets at 471-4 MeV are measured.It is found that for the same target,the average value and width of the angular distribution decrease with an increase of the projectile fragment charge;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 a 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 a projectile fragment can be explained well by a single Rayleigh distribution.The temperature parameter of the emission source of the projectile fragment,calculated from the cumulated squared transverse momentum distribution,decreases with the increase of the size of the projectile fragment.