Development of an energy-tunable positronium beam apparatus using the photodetachment of the positronium negative ion

29th International Conference on Photonic, Electronic, and Atomic Collisions

Chiari, L.^1 ; Michishio, K.^1 ; Oshima, N.^2 ; Nagashima, Y.^1

Department of Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo

162-8601, Japan^1

National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki

305-8568, Japan^2

关键词: Bound state;    Fundamental studies;    Intermediate energies;    Photo-detachment;    Slow positron beam;    Solid surface;    Tokyo University of Science;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/635/8/082003/pdf
DOI  :  10.1088/1742-6596/635/8/082003

来源: IOP

【 摘 要 】

We report on the development of an energy-tunable positronium beam apparatus at Tokyo University of Science. The positronium beam is generated using the photodetachment of the positronium negative ion, a bound state of one positron and two electrons. Positronium negative ions are efficiently emitted from a Na-coated tungsten surface by bombardment with a slow positron beam. The intermediate-energy positronium beam produced in this fashion can be used for fundamental studies of antimatter-matter interactions with solid surfaces.