Positronium and positronium negative ion emission from alkali-metal coated tungsten surfaces

13th International Workshop on Slow Positron Beam Techniques and Applications

Nagashima, Y.^1 ; Michishio, K.^1 ; Terabe, H.^1 ; Suzuki, R.H.^1 ; Iida, S.^1 ; Yamashita, T.^1 ; Kimura, R.^1 ; Tachibana, T.^2 ; Mochizuki, I.^3 ; Wada, K.^3 ; Yagishita, A.^3 ; Hyodo, T.^3

Department of Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan^1

Department of Physics, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima, Tokyo 171-8501, Japan^2

Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan^3

关键词: Coated surface;    Emission efficiencies;    Metal-coated;    Photo-detachment;    Positronium atom;    Time of Flight methods;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/505/1/012037/pdf
DOI  :  10.1088/1742-6596/505/1/012037

来源: IOP

【 摘 要 】

The emission efficiencies of positronium atoms and positronium negative ions from tungsten surfaces increase by alkali-metal coating. We have studied the positronium emission from alkali-metal coated surfaces using the positronium time-of-flight method. We have also performed the observation of the photodetachment of Ps-emitted from a Na-coated surface and the production of an energy-tunable Ps beam employing the photodetachment technique. This paper describes our recent studies using alkali-metal coated surfaces.