Thermal positron interactions with alkali covered tungsten

Takashi Yamashita,Shimpei Iida,Hiroki Terabe,Yasuyuki Nagashima

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms（2016）

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摘要

The branching ratios of positron reemission, positronium emission, positronium negative ion emission and capture to the surface state for thermalized positrons at polycrystalline tungsten surfaces coated with Na, K and Cs have been measured. The data shows that the ratios depend on the coverage of the alkali-metal coating. The fraction of the emitted positronium increases with the coverage of the coating up to 90%.

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关键词

Positron,Positronium,Positronium negative ion,Surface state,Alkali-metal-coated tungsten

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