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 Γ1s = 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.
|Number of pages||7|
|Publication status||Published - 1999|
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Nuclear and High Energy Physics
- Condensed Matter Physics
- Physical and Theoretical Chemistry