Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 37: Nuclear Structure/Spectroscopy VI

HK 37.1: Group Report

Thursday, March 11, 2004, 13:30–14:00, A

X-Ray Spectroscopy of Kaonic Hydrogen Atoms — •Johann Marton — Institut für Mittelenergiephysik, Boltzmanngasse 3, 1090 Vienna, Austria

Kaonic hydrogen atoms were studied at the DAΦNE e⁺−e⁻ collider by resonance formation of Φ-mesons. The K⁻-mesons from their decay were stopped in a cryogenic hydrogen target in which kaonic hydrogen atoms were formed. Their X-ray deexcitation to the ground state was observed and their energy was measured with an array of CCDs with a resolution 150 eV at 6 keV. The shift and broadening of the K spectra relative to the electromagnetic transitions were measured The strong interaction shift amounts to −(183 ± 62) eV with a broadening of (213 ± 138) eV.