Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 57: Hadron Structure and Spectroscopy II

HK 57.3: Talk

Wednesday, March 18, 2009, 17:00–17:15, H-ZO 30

Kaonic X-ray experiments at DAFNE — •M. Cargnelli¹, M. Bazzi², G. Beer³, L. Bombelli⁴, A.M. Bragadireanu^5,2, C. Fiorini⁴, T. Frizzi⁴, F. Ghio⁶, B. Girolami⁶, C. Guaraldo², R. Hayano⁷, M. Iliescu^2,5, T. Ishiwatari¹, M. Iwasaki⁸, P. Kienle⁹, P. Lechner¹⁰, P. Levi Sandri², A. Longoni⁴, V. Lucherini², J. Marton¹, S. Okada², D. Pietreanu², T. Ponta⁵, A. Romero Vidal², A. Scordo², He-Xi Shi⁷, D.L. Sirghi^2,5, F. Sirghi^2,5, H. Soltau¹⁰, L. Struder¹¹, H. Tatsuno⁷, O. Vazquez Doce², E. Widmann¹, and L. Zmeskal¹ — ¹Stefan Meyer Inst., Vienna, Austria — ²INFN, LNF, Frascati, Italy — ³Univ. of Victoria, Canada — ⁴Politec. di Milano, Italy — ⁵IFIN-HH, Bucharest, Romania — ⁶INFN Sez. di Roma, Italy — ⁷Univ. of Tokyo, Japan — ⁸RIKEN, Saitama,Japan — ⁹Techn. Univ. München, Germany — ¹⁰PNSensors, München, Germany — ¹¹MPI f. Extraterr. Phys., Garching, Germany

At the DAFNE collider of LN Frascati we are using the slow kaons to investigate the K-nucleon interaction at rest in hydrogen and deuterium. We are using X-ray spectroscopy of kaonic atoms to measure the strong interaction induced shift and width of the ground state. From these the scattering lengths can be determined, which are essential for the understanding of chiral symmetry breaking in the strangeness sector. Within the project new X-ray detectors were developed: an array of large area silicon drift detectors (SDDs) having excellent energy resolution and good timing which results in a drastic suppression of background. With this technique the measurement of kaonic deuterium X-rays will be feasible for the first time.