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Abstract : Variable energy slow positron beam was used to probe the positronic spur processes in polymers : low density polyethylene and a polyimide Kapton. A fraction of the injected positrons was re-emitted as positron or positronium, whose fraction was dependent on the energy of injected positrons. The energy of the re-emitted positrons could become quite large, even larger than the band-gap energies of the substance. This was considered to be the result of charge-up effect. This effect may provide a new concept for a -field assisted slow positron moderator-.





Autor: Y. Ito H. Abe Y. Tabata

Fuente: https://hal.archives-ouvertes.fr/



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