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Observations of elastic scattering and neutralization of positrons at grazing incidence

Conference ·
OSTI ID:5708405
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Elastic intensity vs. energy (I-V) spectra have been observed using both positrons and electrons at glancing incidence (83/sup 0/ to 56/sup 0/ with respect to the surface normal) in the energy range of 50 to 480 eV from a variety of crystalline solids. All glancing angle positron I-V spectra have broad (greater than or equal to100 eV) features relative to electrons under comparable conditions. The enhanced broadening is associated with the reduced penetration depth of the elastically scattered positrons, and peak positions and widths fit a quasi-kinematic calculation for the intensity from Cu(100). In addition, a positronium (Ps) beam has been formed by scattering positrons at grazing incidence. The Ps formed in this manner has a non isotropic distribution which suggests that the Ps has energy greater than or equal to50 eV. Experimental Ps angular distribution agrees with a theoretical calculation of Ishii. 19 refs., 2 figs.
Research Organization:
Brookhaven National Lab., Upton, NY (USA); Michigan Univ., Ann Arbor (USA). Dept. of Physics; International Business Machines Corp., Yorktown Heights, NY (USA). Thomas J. Watson Research Center; State Univ. of New York, Stony Brook (USA). Coll. of Engineering and Applied Sciences
DOE Contract Number:
AC02-76CH00016
OSTI ID:
5708405
Report Number(s):
BNL-40439; CONF-870715-7; ON: DE88003498
Country of Publication:
United States
Language:
English

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Related Subjects

656003* -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANGULAR DISTRIBUTION
BEAM NEUTRALIZATION
BEAMS
COLLISIONS
COPPER
CRYSTALS
DISTRIBUTION
ELASTIC SCATTERING
ELECTRON BEAMS
ELEMENTS
EMISSION SPECTRA
LEPTON BEAMS
METALS
PARTICLE BEAMS
POSITRON BEAMS
POSITRON COLLISIONS
POSITRONIUM
SCATTERING
SPECTRA
TRANSITION ELEMENTS