Gamma rays and, for the first time, conversion muons of pt fusion have been measured from liquid mixtures of protium, deuterium, and tritium. The rate ${\lambda }_{10}$ for spin flip from the triplet to the singlet state of tμ(1s) was found to be ${\lambda }_{10}$=(1.06±0.13)×${10}^3$μ${\mathit{s}}^{\mathrm{-}1}$, the rate for muon-catalyzed pt fusion from the (I=1) nuclear-spin state to be ${\lambda }_{\mathit{p}\mathit{t}}^{\mathit{f}}$(I=1) =0.067±0.${002}_{\mathrm{-}0.002}^{+0.005\mathrm{}}$μ${\mathit{s}}^{\mathrm{-}1}$, and the and the molecular formation rate to be ${\lambda }_{\mathit{p}\mathit{t}}^{\mathit{m}}$=(7.5±0.$3_{\mathrm{-}0.3}^{+1.0\mathrm{}}$)μ${\mathit{s}}^{\mathrm{-}1}$ (all rates normalized to liquid hydrogen density).

• Received 19 February 1993

DOI:https://doi.org/10.1103/PhysRevLett.70.3720