MEASUREMENT OF THE MUON MASS BY CRITICAL MESIC X-RAY ABSORPTION. I. SCINTILLATION SPECTROMETRY

Mesic x rays from a phosphorus target were analyzed with and without lead absorbers with a NaI(Tl) spectrometer in order to study the 3D yields 2P transition in the mesic phosphorus. The absorption coefficient of the lead absorber was determined; the transition energies of the mesic x rays can easily be determined when this is known. Positions of the two main components of the 3D yields 2P transition of mu mesic phosphorus with respect to the lead K-edge and lead absorption curves for the three assumed muon masses are given. (M.C.G.)