Measurement of parallel and perpendicular momentum distributions of neutron-deficient projectile fragments

The parallel and perpendicular momentum widths of a variety of projectile fragments were measured for the first time using the S800 spectrograph at the National Superconducting Cyclotron Laboratory at Michigan State University. A set of secondary beams from an $^{36}$Ar primary beam at 150 MeV/nucleon were fragmented in a beryllium target with the spectrograph centered at 0$^{\circ}$. The fragmentation products were identified at the focal plane and both the longitudinal and perpendicular momentum distributions were observed in a single setting. The resulting longitudinal momentum distributions have the expected growth with mass-loss (A$_{beam}$-A$_{frag}$). New information on the widths of the perpendicular momentum distribution will be presented and compared to the predictions in the literature.