Статья

Observation of kaonic hydrogen atom x rays

T. M. ItoDepartment of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, JapanR. HayanoDepartment of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, JapanSeitaro NakamuraDepartment of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, JapanTomoki P. TeradaDepartment of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, JapanM. IwasakiDepartment of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, JapanD. R. GillDepartment of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, JapanL. LeeDepartment of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, JapanÅ. OlinDepartment of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, JapanM. SalomonDepartment of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, JapanS. YenDepartment of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, JapanK. BartlettDepartment of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, JapanG. BeerDepartment of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, JapanG. R. MasonDepartment of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, JapanG. TraylingDepartment of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, JapanH. OutaDepartment of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, JapanTakashi TaniguchiDepartment of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, JapanY. YamashitaDepartment of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, JapanR. SekiDepartment of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan

1998en

ABI

Аннотация

We have measured the K-series x rays from kaonic hydrogen atoms and have succeeded for the first time in observing a distinct $K\ensuremath{\alpha}$ peak. The 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 $K\ensuremath{\alpha}$ x rays. The sign of the strong-interaction shift was confirmed to be repulsive, with the results $\ensuremath{\Delta}{E}_{1s}=\ensuremath{-}323\ifmmode\pm\else\textpm\fi{}63 (\mathrm{statistical})\ifmmode\pm\else\textpm\fi{}11 (\mathrm{systematic}) \mathrm{eV}$ and ${\ensuremath{\Gamma}}_{1s}=407\ifmmode\pm\else\textpm\fi{}208\ifmmode\pm\else\textpm\fi{}100 \mathrm{eV}.$ The measured shift and width of the $1s$ state are consistent with those expected from other low energy $\overline{K}N$ data, and thus the long-standing kaonic hydrogen puzzle is resolved. The $K\ensuremath{\alpha}$ x-ray yield per stopped kaon was estimated to be $1.5\ifmmode\pm\else\textpm\fi{}0.5%$ at a hydrogen target density of $10{\ensuremath{\rho}}_{\mathrm{STP}}.$

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Идентификаторы

DOI: 10.1103/physrevc.58.2366

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