| Numéro |
J. Phys. IV France
Volume 03, Numéro C4, Septembre 1993
4th International Workshop on Positron and Positronium Chemistry
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| Page(s) | C4-131 - C4-133 | |
| DOI | https://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
1 Research Center for Nuclear Science and Technology, The University of Tokyo, Tokai, Ibaraki 319-11, Japan
2 Faculty of Engineering, Tokai University, Japan
© EDP Sciences 1993
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. TABATA21 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".
© EDP Sciences 1993