Light fragment spectra to upper kinematic limits for 300 MeV proton reactions with Be and Ag.

Abstract

Single particle inclusive spectra have been measured for the production of several isotopes of H, He, Li, and Be from the interaction of 300 MeV protons with Be and Ag targets. $^{1}$,2H and $^{3}$,4He fragments are measured over a wide range of energies which approach the upper kinematic limits at many of the angles measured. Measurements of the isotopically resolved He, Li, and Be fragments over a more limited energy range are also reported for 190 MeV protons incident on the same two targets. The spectra have been fitted with a phenomenological moving-source model used successfully in earlier studies. However, good fits were not obtained over the extended kinematic ranges measured in this study. A model-independent invariant cross section analysis applied to the $^{3}$,4He data at 300 MeV is used to illuminate the problems that any statistical model will face in trying to explain fragment production at intermediate energies.