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First millimeter-wave spectroscopy of ground-state positronium

First millimeter-wave spectroscopy of ground-state positronium

We report on the first measurement of the Breit–Wigner resonance of the transition from ortho-positronium to para-positronium. We have developed an optical system to accumulate a power of over 20 kW using a frequency-tunable gyrotron and a Fabry–Pérot cavity. This system opens a new era of millimeter-wave spectroscopy, and enables …