Measurement of mesic X-rays with a high pressure gas target

The energy of the muonic transition (2psup(3/2) → 1ssup(1/2)) was measured by the transfer of the muon from hydrogen to 36A and 38A. The average square nucleus radii and the radii of the K moment was determined from the energies. Furthermore, the muonic intensities of the K and L series of argon and argon in hydrogen were measured. A comparison of the measured intensities with cascade calculations showed that the direct capture of the muon in pure gas takes place at high angular momenta, whereas in transfer, the maximum of the angular momentum distribution has very small values (l = 1 to 2). Measurements on pure SF6 and on SF6 in hydrogen gave qualitatively the same results. It could be seen here and with measurements on a mixture of A and Ne that the capture of the muon in the components of a compound or a mixture only depends on the relative number of atoms and not on their charge Z. The pionic transition energy (3d - 2p) and the natural half-width of the pionic 2p level was determined on argon at 150 atm. The ratio of the intensities of the pionic to muonic (A3d → 2p) transition was measured to be 1.13 +- 0.54 in a mixture of hydrogen and argon (1.3% concentration). The transfer probability of a pion from hydrogen to argon was determined to be T = (37 +- 18)%. (orig./LH)