Observation of kaonic hydrogen atom x rays
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033 (Japan)
- Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 152-8551 (Japan)
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3 (CANADA)
- Department of Physics and Astronomy, University of Victoria, Box 3055, Victoria, British Columbia, V8W 3P6 (CANADA)
- Institute for Nuclear Study, University of Tokyo, 3-2-1 Midori, Tanashi, Tokyo 188-0002 (Japan)
- KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801 (Japan)
- W. K. Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, California 91125 (United States)
We have measured the {ital K}-series x rays from kaonic hydrogen atoms and have succeeded for the first time in observing a distinct K{alpha} peak. The {ital L} x-ray peak has also been observed. The strong-interaction shift and width of the kaonic hydrogen atom 1s state were determined from the transition energy and the line width of the K{alpha} x rays. The sign of the strong-interaction shift was confirmed to be repulsive, with the results {Delta}E{sub 1s}={minus}323{plus_minus}63 (statistical){plus_minus}11 (systematic) eV and {Gamma}{sub 1s}=407{plus_minus}208{plus_minus}100 eV. The measured shift and width of the 1s state are consistent with those expected from other low energy {bar K}N data, and thus the long-standing kaonic hydrogen puzzle is resolved. The K{alpha} x-ray yield per stopped kaon was estimated to be 1.5{plus_minus}0.5{percent} at a hydrogen target density of 10{rho}{sub STP}. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 664885
- Journal Information:
- Physical Review, C, Vol. 58, Issue 4; Other Information: PBD: Oct 1998
- Country of Publication:
- United States
- Language:
- English
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