Line shape of the μ H(3 p - 1 s ) transition
Covita, D. ; Anagnostopoulos, D. ; Gorke, H. ; Gotta, D. ; Gruber, A. ; Hirtl, A. ; Ishiwatari, T. ; Indelicato, P. ; Le Bigot, E. ; Nekipelov, M. ; dos Santos, J. ; Schmid, Ph ; Simons, L. ; Trassinelli, M. ; Veloso, J. ; Zmeskal, J.
In: Hyperfine Interactions, 2009, vol. 193, no. 1-3, p. 61-67
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- The line shape of the (3p − 1s) X-ray transition in muonic hydrogen was measured for the first time with a high-resolution crystal spectrometer. The assumption of a statistical population of the hyperfine levels was directly confirmed by experiment, and a measured value for the hyperfine splitting is reported. An X-ray line broadening due to Doppler effect could be clearly identified and attributed to different Coulomb de-excitation transitions which precede the measured radiative transition. The results allow a decisive test of advanced cascade model calculations and establish an alternative and "model free” method to extract the strong-interaction parameters from pionic hydrogen data