The first observation of muon-to-alpha sticking Kβ X-rays in muon catalyzed D-T fusion

At the RIKEN-RAL Muon Facility, we have observed Kβ (3p→1s) μα sticking X-rays from muon catalyzed D-T fusion with various tritium concentrations (Ct=0.1−0.7) and high density solid and liquid phases. Statistics of Kβ X-rays were not enough to determine the peak shape, but the intensity was obtained with an adequate constraint to the Kβ shape using the theoretically calculated peak shape. No significant dependence of the Kβ/Kα ratio on these target conditions was found, and our results (Y(Kβ)/Y(Kα)∼7%) gave smaller values than the existing theoretical calculations. It suggests an existence of unexplained atomic process in the collision processes between (αμ)+ and condensed media.