Publications (4)0.21 Total impact
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Article: Observation of kaonic hydrogen atom X-ray
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ABSTRACT: We successfully observed clear K-series kaonic hydrogen X-rays for the first time taking advantage of two charged pions tagging technique and a gaseous hydrogen target. The strong-interaction energy shift and width of 1s state of K −p atom were determined to be ΔE 1s = -323 ± 63 (statistical) ± 11 (systematic) eV and Г1s = 407 ± 208 ± 100 eV. Our result means that the K −p strong interaction near threshold is repulsive and the long-standing kaonic hydrogen puzzle is solved.Hyperfine Interactions 01/1999; 118(1):45-51. · 0.21 Impact Factor -
Article: Discovery of the repulsive energy shift of the kaonic hydrogen 1s state
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ABSTRACT: The aim in this manuscript is to clarify the progress in understanding the nature of the interaction at the lowest energy, given by the recent kaonic hydrogen X-ray experiment at KEK [1]. We have observed a clear spectrum showing the kaonic hydrogen Kα line, for the first time. The analysis gives the repulsive energy shift to be ΔE(1s) = −323 ± 63(statistical) ± 11 (systematic) eV and the energy width to be Λ(1s) = 407 ± 208 ± 100 eV. This result is consistent with analyses of the previous low-energy scattering data and resolves the long-standing kaonic hydrogen puzzle.Nuclear Physics A. -
Article: Kaonic hydrogen X-ray experiment at KEK
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ABSTRACT: For the further understanding of the -N interaction in the low energy region, we are performing a measurement of K−p X rays at KEK which adopts a new technique to improve the signal-to-background ratio (S/N); specifying the final state of the K−p reaction and using a gaseous hydrogen target (4 atm at 100 K). With this technique three orders of magnitude better S/N and one order higher statistics are expected as compared to previous experiments.Nuclear Physics A. -
Article: Observation of kaonic hydrogen atom x rays
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ABSTRACT: We have measured the K-series x rays from kaonic hydrogen atoms and have succeeded for the first time in observing a distinct Kα 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 Kα x rays. The sign of the strong-interaction shift was confirmed to be repulsive, with the results ΔE1s=-323±63 (statistical)±11 (systematic) eV and Γ1s=407±208±100 eV. The measured shift and width of the 1s state are consistent with those expected from other low energy K̅ N data, and thus the long-standing kaonic hydrogen puzzle is resolved. The Kα x-ray yield per stopped kaon was estimated to be 1.5±0.5% at a hydrogen target density of 10ρSTP.Phys. Rev. C. 58(4).
