The slow positron beam apparatus used in the present study. (IMAGE)

Tokyo University of Science

The slow positron beam apparatus used in the present study.

Caption

The apparatus is installed at Tokyo University of Science (TUS). Positrons emitted from a 22Na source capsule by β+ decay are moderated using a moderator made of tungsten mesh, extracted into vacuum, and transported to a sample using a static magnetic field. The research group at TUS has achieved various results using this apparatus, including experiments on the emission of positronium neutral atoms or positronium negative ions from solid surfaces.

Credit

Professor Yasuyuki Nagashima from Tokyo University of Science

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