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ISSN - 01689002, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2000, vol. 441, p. 401-426

Detailed test of the CsI(Tl) calorimeter for BELLE with photon beams of energy between 20 MeV and 5.4 GeV

Ikeda H., Satpathy A., Ahn B. S., Aulchenko V. M., Bondar A. E., Cheon B. G., Chu T. H., Fukushima M., Garmash A. Yu, Hayashii H., Jang H. K., Kaneyuki K., Kazui K., Kezerashvili G. Ya, Kim H. J., Kremyanskaya E. V., Kuzmin A. S., Lee M. H., Miyabayashi K., Muchnoi N. Yu, Naumenkov A. I., Noguchi S., Park C. S., Popov V. G., Protopopov I. Ya, Pogorelov Yu A., Romanov L. V., Root N. I., Sagawa H., Shatilov D. N., Sidorov A. V., Simonov E. A., Shwartz B. A., Tamai K., Tsukamoto T., Usov Yu V., Watanabe Y., Zhilich V. N.

The results of a beam test of a prototype of the BELLE CsI(Tl) calorimeter are reported. The test used beams of photons with energies spanning the range from 20 MeV to 5.4 GeV, produced at ROKK-1M facility of the Budker Institute of Nuclear Physics. The single-counter energy-equivalent noise was measured to be approx. 200 keV. The design goals for the energy resolution, e.g. 4% at 20 MeV and 1.7% at 5.4 GeV, were achieved using the sum of energy deposits in a 5 × 5 crystal matrices with a single crystal energy threshold of 0.5 MeV; the summed energy deposit measured in the array corresponds to 97 ± 2% of the incident photon energy over the entire energy range. The average position resolution for 470 MeV energy photons was measured to be 8 mm.