Diffusion constant and surface states of positrons in metals |
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| Authors: | Robert Paulin Roger Ripon Werner Brandt |
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| Institution: | 1. Institut National des Sciences et Techniques Nucléaires Saclay, France
2. New York University, 10003, New York, N. Y., USA
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| Abstract: | Positron lifetime spectra and angular correlation curves for seven fine-grained powders of Fe, Co, Ni, and W are analyzed. From the lifetime data, the positron diffusion constant in metals atT=300°K was found to beD +=(1.0±0.5)×10?2 cm2 sec?1. Evidence is presented that positrons are trapped in metal surface states. |
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