We report stopping powers of hydrogen and helium for antiprotons of kinetic energies ranging from about 0.5 keV to 1.1 MeV. The Barkas effect, i.e., a difference in the stopping power for antiprotons and protons of the same energy in the same material, shows up clearly in either of the gases. Moreover, below ≈0.5 keV there is indirect evidence for an increase of the antiproton stopping power. This "nuclear" effect, i.e., energy losses in quasimolecular interactions, shows up in fair agreement with theoretical predictions.
|Titolo:||Antiproton slowing Down in H2 and He and evidence of nuclear stopping power|
|Data di pubblicazione:||1995|
|Digital Object Identifier (DOI):||10.1103/PhysRevLett.74.371|
|Appare nelle tipologie:||1.1 Articolo in rivista|