Energy loss of fragment protons dissociated from 0.2- and 0.5-MeV/amu [Formula Presented] ions incident in carbon foils

Abstract

Energy losses of fragment protons from 0.2- and 0.5-MeV/amu [Formula Presented] were measured at transmission through amorphous carbon foils of thickness less than [Formula Presented] The energy losses of randomly oriented fragment protons and those of the fragment protons aligned in the direction of motion show how the spatial correlation of the protons affects the energy loss. We use the dielectric formalism to calculate the stopping power of amorphous carbon for two spatially correlated protons and compare with the experimental energy-loss data. We conclude that higher energies or thinner foils are necessary to understand the anomalous energy loss of aligned proton pairs. © 2000 The American Physical Society.