Centroid shift of γ rays from positron annihilation in the depletion region of metal-oxide-semiconductor structures
- 7 January 1991
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 58 (1) , 86-88
- https://doi.org/10.1063/1.104399
Abstract
Using metal-oxide-semiconductor (MOS) structures, the shift of centroid (peak) of γ-ray energy distributions emitted from positron annihilation has been measured as a function of incident positron energy. The Doppler centroid shift was found to be consistent with the positron motion in the MOS depletion region. The results are described by a one-dimensional positron diffusion model, and provide information on ‘‘effective’’ positron diffusion length under applied field.Keywords
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