München 2006 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 21: Postersitzung
HK 21.77: Poster
Dienstag, 21. März 2006, 15:30–17:00, P
Exotic-atom spectroscopy with fast read-out CCDs — •M. Nekipelov1, D.D.S. Covita2, W. Erven1, P. Indelicato3, H. Gorke1, D. Gotta1, A. Gruber4, R. Hartmann5, M. Hennebach1, A. Hirtl4, J.M.F. dos Santos2, L.M. Simons6, M. Trassinelli3, L. Strüder7, J.F.C.A. Veloso8, and J. Zmeskal4 — 1IKP, FZ Jülich, Germany — 2Phys. Dept., Univ. Coimbra, Portugal — 3Lab. Kastler-Brossel, Univ. P. et M.Curie, Paris — 4SMI, Österr. Ak. der Wiss., Vienna, Austria — 5PNSensor GmbH, Munich — 6PSI, Switzerland — 7MPE, Garching — 8Phys. Dept., Univ. Aveiro, Portugal
Exotic-atom X-ray spectroscopy at high intensity beams requires high rate capability together with efficient background rejection and, in addition, preserving the good energy resolution owing to semiconductor devices. Based on a fully depleted CCD (pnCCD), as used among others in the XMM Newton mission, a high-rate detector has been developed. A prototype system using one CCD device of 64× 64 pixels with 150 µ m pixel size was equipped with a dedicated electronics allowing the read-out of up to 500 frames per second. Such a system is ideally suited for the optimisation of beam injection into the cyclotron trap at the low-energy pion beam at the Paul Scherrer Institut (PSI). For that the characteristic X-radiation from muonic and pionic helium has been detected inthe energy range from 1.8 to 15 keV. The high statistics of such measurements also yielded a more precise determination of strong-interaction effects in pionic helium. The working principle of the detector and first results from π He are presented.