title: First measurement of kaonic helium-3 X-rays.
abstract: The first observation of the kaonic (3)He 3d→2p transition was made, using slow K- mesons stopped in a gaseous (3)He target. The kaonic atom X-rays were detected with large-area silicon drift detectors using the timing information of the K+K- pairs of ϕ-meson decays produced by the DAΦNE e+e- collider. The strong interaction shift of the kaonic (3)He 2p state was determined to be -2±2(stat)±4(syst) eV.
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authors.lastname: Bazzi
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authors.lastname: Beer
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authors.lastname: Bombelli
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authors.lastname: Bragadireanu
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authors.lastname: Curceanu Petrascu
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authors.lastname: Iwasaki
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authors.lastname: Kienle
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authors.lastname: Levi Sandri
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authors.lastname: Longoni
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authors.lastname: Okada
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authors.lastname: Romero Vidal
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authors.lastname: Shi
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authors.lastname: Sirghi
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authors.lastname: Tatsuno
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authors.lastname: Tudorache
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authors.lastname: Vazquez Doce
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authors.lastname: Wünschek
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authors.lastname: Zmeskal