Kaonic helium X-ray measurement in the SIDDHARTA experiment

• Published in: Journal of physics. Conference series Vol. 312; no. 2; pp. 022021 - 6
• Main Authors: Shi, H, Bazzi, M, Beer, G, Bombelli, L, Bragadireanu, A M, Cargnelli, E M, Corradi, G, (Petrascu), C Curceanu, d'Ufflzi, A, Fiorini, C, Frizzi, T, Ghio, F, Girolami, B, Guaraldo, C, Hayano, R S, Iliescu, M, Ishiwatari, T, Iwasaki, M, Kienle, P, Sandri, P Levi, Longoni, A, Lucherini, V, Marton, J, Okada, S, Pietreanu, D, Ponta, T, Rizzo, A, Vidal, A Romero, Scordo, A, Sirghi, D L, Sirghi, F, Tatsuno, H, Tudorache, A, Tudorache, V, Doce, O Vazquez, Widmann, E, Zmeskal, J
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 23.09.2011
• Subjects: Atomic beam spectroscopy; Cooperation; Drift; Kaons; Physics; Silicon; Three dimensional; Time measurements; X-rays
• ISSN: 1742-6596; 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/312/2/022021

The SIDDHARTA (SIlicon Drift Detector for Hadronic Atom Research with Timing Application) collaboration performed X-ray spectroscopy measurement of kaonic atoms at the DAΦNE e+e−collider. Low energy negative kaons from DAΦNE φ-factory were stopped in gaseous targets to produce kaonic atoms. We employed specially designed Silicon Drift Detectors(SDDs) to detect the kaonic X-rays. Based on the energy of kaonic- 4He 3d → 2p transition, we determined a new value of the 2p level strong-interaction shift of kaonic- 4He: 0 ± 6 (stat.)± 2 (syst.) eV[1]. Together with the result of recent E570 experiment[2] at the KEK-PS, a small shift (if any) of kaonic- 4He 2p level has become well established.