Numéro
J. Phys. IV France
Volume 03, Numéro C4, Septembre 1993
4th International Workshop on Positron and Positronium Chemistry
Page(s) C4-131 - C4-133
DOI http://dx.doi.org/10.1051/jp4:1993416
4th International Workshop on Positron and Positronium Chemistry

J. Phys. IV France 03 (1993) C4-131-C4-133

DOI: 10.1051/jp4:1993416

Positron spur structure emulated by variable energy slow positron beam

Y. ITO1, H. ABE2 and Y. TABATA2

1  Research Center for Nuclear Science and Technology, The University of Tokyo, Tokai, Ibaraki 319-11, Japan
2  Faculty of Engineering, Tokai University, Japan


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".



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