Line Shape of the $\ensuremath{\mu}\mathrm{H}(3p\ensuremath{-}1s)$ Hyperfine Transitions

Line Shape of the $μ H (3 p - 1 s)$ Hyperfine Transitions

D. S. Covita, D. F. Anagnostopoulos, H. Gorke, D. Gotta, A. Gruber, A. Hirtl, T. Ishiwatari, P. Indelicato, E.-O. Le Bigot, M. Nekipelov, J. M. F. dos Santos, Ph. Schmid, L. M. Simons, M. Trassinelli, J. F. C. A. Veloso, and J. Zmeskal

Phys. Rev. Lett. 102, 023401 – Published 12 January 2009

Abstract

The $(3 p - 1 s)$ x-ray transition to the muonic hydrogen ground state was measured with a high-resolution crystal spectrometer. A Doppler effect broadening of the x-ray line was established which could be attributed to different Coulomb deexcitation steps preceding the measured transition. The assumption of a statistical population of the hyperfine levels of the muonic hydrogen ground state was directly confirmed by the experiment, and measured values for the hyperfine splitting can be reported. The results allow a decisive test of advanced cascade model calculations and establish a method to extract fundamental strong-interaction parameters from pionic hydrogen experiments.

Received 6 October 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.023401

Authors & Affiliations

D. S. Covita^1,2, D. F. Anagnostopoulos³, H. Gorke⁴, D. Gotta⁵, A. Gruber⁶, A. Hirtl⁶, T. Ishiwatari⁶, P. Indelicato⁷, E.-O. Le Bigot⁷, M. Nekipelov⁵, J. M. F. dos Santos¹, Ph. Schmid⁶, L. M. Simons^2,*, M. Trassinelli^7,†, J. F. C. A. Veloso⁸, and J. Zmeskal⁶

¹Department of Physics, Coimbra University, P-3000 Coimbra, Portugal
²Paul Scherrer Institut (PSI), CH 5232-Villigen, Switzerland
³Department of Materials Science and Engineering, University of Ioannina, Ioannina, GR-45110, Greece
⁴Zentralabteilung für Elektronik, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany
⁵Institut für Kernphysik, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany
⁶Stefan Meyer Institut for Subatomic Physics, Austrian Academy of Sciences, A-1090 Vienna, Austria
⁷Laboratoire Kastler Brossel, UPMC-Paris 6, ENS, CNRS; Case 74, 4 place Jussieu, F-75005 Paris, France
⁸Department of Physics, Aveiro University, P-3810 Aveiro, Portugal

^*Present address: Department of Physics, Coimbra University, P-3000 Coimbra, Portugal
^†Present address: Inst. des NanoSciences de Paris, CNRS UMR7588 and UMPC-Paris 6, F-75015 Paris, France

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Vol. 102, Iss. 2 — 16 January 2009

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Physical Review Letters

Line Shape of the μH(3p−1s) Hyperfine Transitions

D. S. Covita, D. F. Anagnostopoulos, H. Gorke, D. Gotta, A. Gruber, A. Hirtl, T. Ishiwatari, P. Indelicato, E.-O. Le Bigot, M. Nekipelov, J. M. F. dos Santos, Ph. Schmid, L. M. Simons, M. Trassinelli, J. F. C. A. Veloso, and J. Zmeskal

Phys. Rev. Lett. 102, 023401 – Published 12 January 2009

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Line Shape of the $μ H (3 p - 1 s)$ Hyperfine Transitions