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Phys. Rev. Lett. 94, 212302 (2005) [4 pages]

Measurement of the Kaonic Hydrogen X-Ray Spectrum

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G. Beer1, A. M. Bragadireanu2,3, M. Cargnelli4, C. Curceanu-Petrascu2, J.-P. Egger5, H. Fuhrmann4, C. Guaraldo2, M. Iliescu2,3, T. Ishiwatari4, K. Itahashi6, M. Iwasaki6, P. Kienle4,7, T. Koike6, B. Lauss8, V. Lucherini2, L. Ludhova9, J. Marton4, F. Mulhauser9, T. Ponta3, L. A. Schaller9, R. Seki10,11, D. L. Sirghi2,3, F. Sirghi2, and J. Zmeskal4 (DEAR Collaboration)
1Department of Physics and Astronomy, University of Victoria, P. O. Box 3055, Victoria, British Columbia V8W 3P6, Canada
2Laboratori Nazionali di Frascati, INFN, C. P. 13, Via E. Fermi 40, I-00044 Frascati, Italy
3Institute of Physics and Nuclear Engineering “Horia Hulubei”, Particle Physics Department, IFIN-HH, P.O. Box MG-6, R-76900 Magurele, Bucharest, Romania
4Stefan Meyer Institut für subatomare Physik, Austrian Academy of Sciences, Boltzmanngasse 3, A-1090 Vienna, Austria
5Institut de Physique, Université de Neuchâtel, 1 rue A. -L. Breguet, CH-2000 Neuchâtel, Switzerland
6Institute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama, 351-0198, Japan
7Technical University, Munich, 80290 Germany
8Department of Physics, University of California, 366 LeConte Hall, Berkeley, California 94720, USA
9Institut de Physique, Université de Fribourg, CH-1700 Fribourg, Switzerland
10Department of Physics and Astrophysics, California State University, Northridge, California 91330, USA
11W.E. Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, California 91125, USA

Received 21 September 2004; published 2 June 2005

The DEAR (DAΦNE exotic atom research) experiment measured the energy of x rays emitted in the transitions to the ground state of kaonic hydrogen. The measured values for the shift ϵ and the width Γ of the 1s state due to the K-p strong interaction are ϵ1s=-193±37 (stat) ±6 (syst) eV and Γ1s=249±111 (stat) ±30 (syst) eV, the most precise values yet obtained. The pattern of the kaonic hydrogen K-series lines, Kα, Kβ, and Kγ, was disentangled for the first time.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.212302
DOI:
10.1103/PhysRevLett.94.212302
PACS:
13.75.Jz, 25.80.Nv, 36.10.Gv