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THERMAL-ACTIVATION OF POSITRONIUM FROM THIN AG(100) FILMS IN BACKSCATTERING AND TRANSMISSION GEOMETRIES

POULSEN, MR; CHARLTON, M; CHEVALLIER, J; DEUTCH, BI; JORGENSEN, LV; LARICCHIA, G; (1991) THERMAL-ACTIVATION OF POSITRONIUM FROM THIN AG(100) FILMS IN BACKSCATTERING AND TRANSMISSION GEOMETRIES. J PHYS-CONDENS MAT , 3 (17) 2849 - 2858.

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Abstract

Emission of positronium (Ps) from thin Ag(100) foils (1500-1900 angstrom) has been studied in reflection and transmission geometries. Positron transmission probabilities of the 1900 angstrom foil have been extracted from the data and fitted to give an effective positron diffusion length of 425-475 angstrom. Furthermore, the one-dimensional velocity distribution perpendicular to the foil surface has been estimated to be non-Maxwellian. The conversion efficiency of incident positrons to Ps in transmission is estimated to be approximately 12% for a 1900 angstrom foil at 800 K.

Type:Article
Title:THERMAL-ACTIVATION OF POSITRONIUM FROM THIN AG(100) FILMS IN BACKSCATTERING AND TRANSMISSION GEOMETRIES
Keywords:SLOW POSITRONS, SURFACES, TRANSITION
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Physics and Astronomy

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