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Experimental method for determination of the branching ratio of reemitted positrons

Author
Schut, H.
Published
United States : [publisher not identified], 1986
Springfield, Va.: National Technical Information Service, [approximately 1986]
Physical Description
microfiche : negative ; 11 x 15 cm
Additional Creators
Lynn, K. G., Nielsen, B., and van Veen, A.

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Summary
An experimental method is proposed and tested for the determination of the branching of positrons into positron surface states and positronium states. A study is made of positrons backdiffusing to the surface of incidence in variable energy positron beam experiments. The method is based on positronium fraction measurements using a Ge solid state detector under two experimental conditions (1) removal of the reemitted positrons from the sample surface and detector region and (2) attraction of reemitted positrons towards the sample surface by applying an electric field. It is shown that by this method the effect of a change in the surface condition on the positronium fraction can be separated from effects due to changes of the bulk defect population.
Report Numbers
DE87002140; BNL-38796; CONF-860798-1
Other Subject(s)
Collection
NTIS collection.
Note
DOE contract number: AC02-76CH00016
OSTI Identifier 7020764
Research organization: Brookhaven National Lab., Upton, NY (USA).
Research organization: Interuniversitair Reactor Inst., Delft (Netherlands).
View MARC record | catkey: 47370931