Single and Double Ionization of Helium by Fast Antiproton and Proton Impact
- 27 October 1986
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 57 (17) , 2147-2150
- https://doi.org/10.1103/physrevlett.57.2147
Abstract
The first ion-atom-collision data obtained with antiprotons are presented. We measured the single- and double-ionization cross section for 0.5-5-MeV antiprotons and protons colliding with helium. For ion energies above ∼ 2 MeV, the single-ionization cross section is the same for protons and antiprotons. However, surprisingly, the double-ionization cross section for antiprotons is approximately a factor of 2 larger than that for protons. The present data constitute a challenge for future theoretical models of charged-particle-atom collisions.Keywords
This publication has 12 references indexed in Scilit:
- Electron production in proton collisions: total cross sectionsReviews of Modern Physics, 1985
- Scattering correlations in ion-atom collisionsNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1985
- A new theoretical method for collisions with correlated atomsNuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1985
- High-velocity limits for the ratio of double to single ionisation by charged particles and by photonsJournal of Physics B: Atomic and Molecular Physics, 1984
- An experimental investigation of double ionisation of helium atoms in collisions with fast, fully stripped ionsJournal of Physics B: Atomic and Molecular Physics, 1984
- Double Ionization of Helium by Protons and Electrons at High VelocitiesPhysical Review Letters, 1982
- Charge-state distributions of noble-gas atoms after electron capture by protonsJournal of Physics B: Atomic and Molecular Physics, 1979
- The Barkas effect - or Z13, Z14-corrections to stopping of swift charged particlesNuclear Instruments and Methods, 1976
- Importance of Correlation Effects in the Ionization of Helium by Electron ImpactPhysical Review Letters, 1966
- Classical Theory of Atomic Collisions. I. Theory of Inelastic CollisionsPhysical Review B, 1965