Strong-interaction shifts and widths of kaonic helium isotopes

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• 作者：SIDDHARTA Collaboration ; T. Ishiwatari ; M. Bazzi ; G. Beer ; L. Bombelli ; A.M. Bragadireanu ; M. Cargnelli ; C. Curceanu (Petrascu) ; A. d?Uffizi ; C. Fiorini ; T. Frizzi ; F. Ghio ; C. Guaraldo ; R.S. Hayano ; M. Iliescu ; M. Iwasaki ; P. Kienle ; P. Levi S ; ri ; A. Longoni ; J. Marton ; et al.
• 关键词：Exotic atoms ; Kaonic helium ; Silicon-drift detectors ; Strong interaction
• 刊名：Nuclear Physics A
• 出版年：2013
• 出版时间：20 September, 2013
• 年：2013
• 卷：914
• 期：Complete
• 页码：305-309
• 全文大小：111 K

文摘

The kaonic ³He and ⁴He 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 pairs produced by the DA¦µNE collider. The strong-interaction shifts and widths both of the kaonic ³He and ⁴He 2m>pm> states 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.