New parameter-free polarization potentials in low-energy positron collisions

Details New parameter-free polarization potentials in low-energy positron collisions New parameter-free polarization potentials in low-energy positron collisions

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nascp3058...71j&link_type=abstract

In NASA, Goddard Space Flight Center, Annihilation in Gases and Galaxies, NASA CP-3058 p 71-86 (SEE N90-18957 11-70)

Other

Atomic Collisions, Ionization Potentials, Polarization (Waves), Positrons, Scattering Cross Sections, Atomic Energy Levels, Electron Gas, Methane, Molecular Collisions, Particle Production, Positronium, Schroedinger Equation, Targets

Scientific paper

The polarization potential plays a decisive role in shaping up the cross sections in low energy positron collisions with atoms and molecules. However, its inclusion without involving any adjustable parameter, is still a challenge. Various other techniques employed so far for positron collisions are summarized, and a new, nonadjustable and very simple form of the polarization potential for positron-atom (molecule) collisions below the threshold of positronium formation is discussed. This new recently proposed potential is based on the correlation energy of a single positron in a homogeneous electron gas. The correlation energy was calculated by solving the Schrodinger equation of the positron-electron system and fitted to an analytical form in various ranges of the density parameter. In the outside region, the correlation energy is joined smoothly with the correct asymptotic form. This new positron correlation polarization (PCOP) potential was tested on several atomic and molecular targets such as the Ar, CO, and CH4. The results on the total and differential cross sections on these targets are shown along with the experimental data where available.

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