Dynamics of matter-, antimatter-atom collisions
Utilizing the classical trajectory Monte Carlo (CTMC) technique, the author has undertaken the first comprehensive study of antimatter-atom collisions in the intermediate velocity regime (1 to 7 a.u.). This work has elucidated the effects of varying projectile mass and sign of charge in the collisions of electrons, positrons, protons and antiprotons with helium and krypton. Using both a screened Coulomb potential and a newly implemented model potential approach he has calculated total and differential cross sections for single electron removal processes in these systems. By analysis of these cross sections and from a detailed examination of the individual CTMC trajectories, he has formulated a simple model of the collision dynamics which lead to the predicted, and observed, behavior of these collisions. For example, he has found that due to their smaller mass relative to protons, positrons may readily vector momentum match with an orbital electron, capturing it. Consequently, at large impact velocities, positrons are more likely to remove an electron by charge transfer than are equivelocity protons. Further, he has demonstrated that a resolution of the discrepancies which exist between the theoretical consensus and the existing experimental measurements of the positronium formation cross section can be accomplished by taking into account the lack of complete confinement of positrons scattered to large angles and the accompanying loss of positron flux.
- Research Organization:
- Missouri Univ., Rolla, MO (United States)
- OSTI ID:
- 5220618
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ANTIBARYONS
ANTIMATTER
ANTINUCLEI
ANTINUCLEONS
ANTIPARTICLES
ANTIPROTONS
ATOM COLLISIONS
BARYONS
CAPTURE
CATIONS
CHARGE EXCHANGE
CHARGED PARTICLES
COLLISIONS
COMPARATIVE EVALUATIONS
COULOMB FIELD
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ELECTRIC FIELDS
ELECTRON CAPTURE
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ELEMENTARY PARTICLES
ELEMENTS
EVALUATION
FERMIONS
FLUIDS
GASES
HADRONS
HELIUM
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
KRYPTON
MASS
MATHEMATICAL MODELS
MATTER
MONTE CARLO METHOD
NONMETALS
NUCLEI
NUCLEONS
POSITRON COLLISIONS
POSITRON-ATOM COLLISIONS
POSITRONIUM
RARE GASES
TOTAL CROSS SECTIONS