Strong-interaction shifts and widths of kaonic helium isotopes.
The kaonic3He and4He [Formula: see text] transitions in gaseous targets were observed by the SIDDHARTA experiment. The X-ray energies of these transitions were measured with large-area silicon-drift detectors using the timing information of the [Formula: see text] pairs produced by the DAΦNE [Formula: see text] collider. The strong-interaction shifts and widths both of the kaonic3He and4He 2pstates were determined, which are much smaller than the results obtained by the previous experiments. The "kaonic helium puzzle" (a discrepancy between theory and experiment) was now resolved.
Stefan-Meyer-Institut für subatomare Physik, Vienna, Austria.
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Ishiwatari
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Bazzi
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Beer
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Bombelli
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Bragadireanu
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Cargnelli
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Curceanu Petrascu
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Dʼuffizi
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Fiorini
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Frizzi
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Ghio
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Guaraldo
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Hayano
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Iliescu
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Iwasaki
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Kienle
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Levi Sandri
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Longoni
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Marton
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Okada
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Pietreanu
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Ponta
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Rizzo
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Romero Vidal
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Sbardella
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Scordo
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Sirghi
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Sirghi
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Tatsuno
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Tudorache
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Tudorache
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Vazquez Doce
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Widmann
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Wünschek
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Zmeskal
Exotic atoms; Kaonic helium; Silicon-drift detectors; Strong interaction