M. Salomon

Observation of Kaonic Hydrogen K α X Rays

We have measured the shift and width of the kaonic hydrogen 1s state due to the {ovr K}N strong interaction. We have observed, for the first time, distinct K-series kaonic hydrogen x rays with good signal-to-noise ratio in the energy spectrum. The measured energy shift and width were determined to be {Delta}E(1s)=-323{plus_minus}63(stat){plus_minus}11(syst)eV (repulsive) and {Gamma}(1s)=407{plus_minus}208(stat){plus_minus}100(syst)eV,respectively. {copyright} {ital 1997} {ital The American Physical Society}

A multi-anode photomultiplier with position sensitivity

Abstract We have measured the properties of a specially developed photomultiplier with proximity dynodes and 10 wire anodes. This design allows us to determine the position of emission of the photoelectrons from the cathode with an accuracy of 1.3 mm fwhm. This tube is also extremely fast due to the short transit time and the geometry of its dynodes.

A new approach to measure kaonic hydrogen X-rays

Abstract Previous kaonic hydrogen X-ray experiments suffered from a poor signal-to-background level. This has been overcome in the present measurement through the use of a gaseous hydrogen target and the imposition of a two-charged-pion tagging requirement. In this paper a full technical description is given of the experimental methods employed.

Observation of the kaonic hydrogen K(alpha) x-ray

We have measured the shift and width of the kaonic hydrogen 1s state due to the {ovr K}N strong interaction. We have observed, for the first time, distinct K-series kaonic hydrogen x rays with good signal-to-noise ratio in the energy spectrum. The measured energy shift and width were determined to be {Delta}E(1s)=-323{plus_minus}63(stat){plus_minus}11(syst)eV (repulsive) and {Gamma}(1s)=407{plus_minus}208(stat){plus_minus}100(syst)eV,respectively. {copyright} {ital 1997} {ital The American Physical Society}

OBSERVATION OF KAONIC HYDROGEN ATOM X-RAY

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 ΔE1s = -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.

Discovery of the repulsive energy shift of the kaonic hydrogen 1s state

Abstract The aim in this manuscript is to clarify the progress in understanding the nature of the K ¯ N 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 K α line, for the first time. The analysis gives the repulsive energy shift to be Δ E (1 s ) = −323 ± 63(statistical) ± 11 (systematic) eV and the energy width to be Λ(1 s ) = 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.

Kaonic hydrogen X-ray experiment at KEK

Abstract For the further understanding of the K -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.

Observation of Kaonic Hydrogen K{sub {alpha}} X Rays

We have measured the shift and width of the kaonic hydrogen 1s state due to the {ovr K}N strong interaction. We have observed, for the first time, distinct K-series kaonic hydrogen x rays with good signal-to-noise ratio in the energy spectrum. The measured energy shift and width were determined to be {Delta}E(1s)=-323{plus_minus}63(stat){plus_minus}11(syst)eV (repulsive) and {Gamma}(1s)=407{plus_minus}208(stat){plus_minus}100(syst)eV,respectively. {copyright} {ital 1997} {ital The American Physical Society}

Observation of Kaonic HydrogenKαX Rays

We have measured the shift and width of the kaonic hydrogen 1s state due to the {ovr K}N strong interaction. We have observed, for the first time, distinct K-series kaonic hydrogen x rays with good signal-to-noise ratio in the energy spectrum. The measured energy shift and width were determined to be {Delta}E(1s)=-323{plus_minus}63(stat){plus_minus}11(syst)eV (repulsive) and {Gamma}(1s)=407{plus_minus}208(stat){plus_minus}100(syst)eV,respectively. {copyright} {ital 1997} {ital The American Physical Society}