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The CELSIUS/WASA detector facility

Zabierowski Janusz, Bargholtz C., Bogoslawsky D., Bondar A., Calén H., Clement H., Demirörs L., Ekström C., Fransson K., Fridén C. J., Gornov M., Grebenev V., Greiff J., Gurov Y., Gustafsson L., Höistad B., Ivanov G., Jacewicz M., Jiganov E., Johansson A., Johansson T., Kelcta S., Kilian K., Kimura N., Koch I., Kullander S., Kupść A., Kurdadze L., Kuzmin A., Kuznetsov A., Marciniewsi P., Morosov B., Nawrot A., Nefkens B. M K, Oelert W., Oreshkin S., Pauly C., Petukhov Y., Povtorejko A., Pätzold J., Reistad D., Ruber R. J M Y, Sandukovsky V., Scobel W., Sefzick T., Shafigullin R., Sidorov V., Shwartz B., Sopov V., Stepaniak J., Sukhanov A., Tchernychev V., Tegnér P. E., Thörngren Engblom P., Tikhomirov V., Turowiecki A., Wagner G., Wiedner U., Wilhelmsen K., Wilhelmi Z., Yamamoto A., Yamaoka H., Zabierowski J., Zlomańczuk J.

A discussion on the 4π multidetector system for investigation of η-meson rare decays at the Uppsala CELSIUS storage ring was presented. The system includes a Central Detector for particles scattered isotropically, a Pellet Target system and a Forward detector, for particles scattered at angles below 18°, together with a Tagging Spectrometer for He recoils emitted at 0°. The results showed that the maximum geometric acceptance, 0.7 msr, was reached at a relative rigidity of 0.65, and depended critically on the size of the detectors.