Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 371-374 |
| Number of pages | 4 |
| Journal | Physical Review Letters |
| Volume | 74 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 1995 |
| Externally published | Yes |
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