Total cross sections for positrons scattered elastically from helium based on new measurements of total ionization cross sections

Details Total cross sections for positrons scattered elastically from helium based on new measurements of total ionization cross sections Total cross sections for positrons scattered elastically from helium based on new measurements of total ionization cross sections

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nascp3058..121d&link_type=abstract

In NASA, Goddard Space Flight Center, Annihilation in Gases and Galaxies, NASA CP-3058 p 121-123 (SEE N90-18957 11-70)

Other

Annihilation Reactions, Elastic Scattering, Helium Atoms, Ionization Cross Sections, Positrons, Scattering Cross Sections, Atomic Collisions, Atomic Excitations, High Resolution, Particle Production, Positronium, Time Of Flight Spectrometers

Scientific paper

An improved technique is presented for employing the 2.3m spectrometer to measure total ionization cross sections, Q sub ion, for positrons incident on He. The new ionization cross section agree with the values reported earlier. Estimates are also presented of total elastic scattering cross section, Q sub el, obtained by subtracting from total scattering cross sections, Q sub tot, reported in the literature, the Q sub ion and Q sub Ps (total positronium formation cross sections) and total excitation cross sections, Q sub ex, published by another researcher. The Q sub ion and Q sub el measured with the 3m high resolution time-of-flight spectrometer for 54.9eV positrons are in accord with the results from the 2.3m spectrometer. The ionization cross sections are in fair agreement with theory tending for the most part to be higher, especially at 76.3 and 88.5eV. The elastic cross section agree quite well with theory to the vicinity of 50eV, but at 60eV and above the experimental elastic cross sections climb to and remain at about 0.30 pi a sub o sq while the theoretical values steadily decrease.

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