Faculté des sciences

Kaonic nitrogen X-ray transition yields in a gaseous target

Ishiwatari, T. ; Beer, G. ; Bragadireanu, A. M. ; Cargnelli, M. ; Curceanu-Petrascu, C. ; Egger, J.-P. ; Fuhrmann, H. ; Guaraldo, C. ; Kienle, P. ; Koike, T. ; Iliescu, M. ; Itahashi, K. ; Iwasaki, M. ; Lauss, B. ; Lucherini, V. ; Ludhova, Livia ; Marton, J. ; Mulhauser, Françoise ; Ponta, T. ; Schaller, Lukas A. ; Seki, R. ; Sirghi, D. L. ; Sirghi, F. ; Strasser, P. ; Zmeskal, J.

In: Physics Letters B, 2004, vol. 593, p. 48-54

The first measurement of the yields of three kaonic nitrogen X-ray transitions, using the DEAR (DAΦNE Exotic Atom Research) setup at the DAΦNE collider of Frascati, is reported. The yields are 41.5±8.7(stat.)±4.1(sys.)% for the n=7→6 transition, 55.0±3.9(stat.)±5.5(sys.)% for the n=6→5 transition and 57.4±15.2(stat.)±5.7(sys.)% for the n=5→4 transition at a density ρ=3.4ρNTP. By... More

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    Summary
    The first measurement of the yields of three kaonic nitrogen X-ray transitions, using the DEAR (DAΦNE Exotic Atom Research) setup at the DAΦNE collider of Frascati, is reported. The yields are 41.5±8.7(stat.)±4.1(sys.)% for the n=7→6 transition, 55.0±3.9(stat.)±5.5(sys.)% for the n=6→5 transition and 57.4±15.2(stat.)±5.7(sys.)% for the n=5→4 transition at a density ρ=3.4ρNTP. By using the experimental yields in an atomic cascade calculation, a 1 to 3% K-shell electron population in the n=6 level was deduced.