Single and double ionization of helium by fast antiproton and proton impact

Journal Article · Sun Oct 26 23:00:00 EST 1986 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.57.2147· OSTI ID:6954765

Andersen, L H; Hvelplund, P; Knudsen, H; Mo-dash-barller, S P; Elsener, K; Rensfelt, K H; Uggerho-dash-barj, E

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.

• Research Organization: Institute of Physics, University of Aarhus, DK-8000 Aarhus C, Denmark
• OSTI ID: 6954765
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 57:17; ISSN PRLTA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ANTIBARYONS
ANTIMATTER
ANTINUCLEI
ANTINUCLEONS
ANTIPARTICLES
ANTIPROTONS
ATOM COLLISIONS
BARYONS
CHARGE STATE
COLLISIONS
CROSS SECTIONS
DATA
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
EXPERIMENTAL DATA
FERMIONS
FLUIDS
GASES
HADRONS
HELIUM
INFORMATION
ION COLLISIONS
ION-ATOM COLLISIONS
IONIZATION
MEV RANGE
MEV RANGE 01-10
NONMETALS
NUCLEI
NUCLEONS
NUMERICAL DATA
PROTONS
RARE GASES
TIME-OF-FLIGHT METHOD