Anticusp and binary peak structures in the electronic spectra arising from proton- and antiproton-helium collisions

Journal Article · Thu Dec 14 23:00:00 EST 1989 · Physical Review (Section) A: General Physics; (USA)

DOI:https://doi.org/10.1103/PhysRevA.40.7373· OSTI ID:7265873

Reinhold, C O; Schultz, D R ^[1]

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1. Department of Physics and Laboratory for Atomic and Molecular Research, University of Missouri-Rolla, Rolla, Missouri 65401 (US)

The spectra of electrons ejected in collisions of protons and antiprotons with helium at impact energies of 100 and 500 keV are reported and compared. These calculations extend recent studies of the electronic spectra by means of the classical-trajectory Monte Carlo method to consider more energetic ejected electrons. Specifically, these new calculations exhibit the well-known binary peak, around which protons and antiprotons are shown to yield similar results. On the other hand, as predicted by quantum-mechanical distorted-wave approximations, a clear dip or anticusp is found in the electronic spectra produced by antiproton impact at electron velocities close to the projectile velocity, unlike the enhancement or cusp found for proton impact. Our results are consistent with simple dynamical mechanisms that reflect the two-center nature of the collision.

• OSTI ID: 7265873
• Journal Information: Physical Review (Section) A: General Physics; (USA), Journal Name: Physical Review (Section) A: General Physics; (USA) Vol. 40:12; ISSN PLRAA; ISSN 0556-2791
• 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
CATIONS
CHARGED PARTICLES
COLLISIONS
ELECTRON EMISSION
ELECTRON SPECTRA
ELEMENTARY PARTICLES
ELEMENTS
EMISSION
ENERGY RANGE
FERMIONS
FINE STRUCTURE
FLUIDS
GASES
HADRONS
HELIUM
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
KEV RANGE
KEV RANGE 100-1000
NONMETALS
NUCLEI
NUCLEONS
RARE GASES
SPECTRA