Precise measurement of the hyperfine splitting constant of positronium using sub-THz radiation

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Hyperfine splitting of positronium, which is the energy difference between ortho-positronium (o-Ps) and para-positronium (p-Ps), has 3.9σdeviation between theoretical expectations and experimental results. Observing direct stimulated transition from o-Ps to p-Ps under sub-THz radiation is effective to investigate the discrepancy. A sub-THz high power light source gyrotron, a high-Finesse Fabry-Perot cavity, a quasi-optical Gaussian converter and a detector simulation has been developed and optimized, which has enabled the transition observation.