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The direct transition from o-Ps to p-Ps was firstly observed, using a gyrotron, a mode-converter and a Fabry-Pérot cavity. The Einstein's A coefficient is measured as 3.9 (+1.8 -1.7) · 10-8 s-1. It is the first step to directly examine a reported discrepancy of positronium hyperfine splitting.
Date of Conference: 2-7 Oct. 2011