Measurement of total cross sections for low energy positron-helium collisions. (Positron backscattering from metal surface)
- 1 August 1972
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic and Molecular Physics
- Vol. 5 (8), L167-L169
- https://doi.org/10.1088/0022-3700/5/8/007
Abstract
An efficient method for the conversion of the high energy positrons emitted by Na22 into slow positrons of energy about 1 eV has been developed using the backscattering of positrons from a gold surface coated with magnesium oxide powder. These positrons have been used for the measurement of the total cross section for positron-helium collisions at energies between 2 eV and 20 eV. A preliminary value for the positron-argon cross section at 8 eV is also given.Keywords
This publication has 4 references indexed in Scilit:
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- Measurements of the kinetic energy of free positronium formed in MgOPhysics Letters A, 1971
- Annihilation libre de l'ortho-positonium formé dans certaines poudres de grande surface spécifiqueJournal de Physique, 1968