Author/Authors :
Ohshima، نويسنده , , Y. and Ahn، نويسنده , , H.S. and Aoki، نويسنده , , M. and Awa، نويسنده , , Mary S. and Fukushima، نويسنده , , M. and Hayashii، نويسنده , , H. and Hu، نويسنده , , X.Q. and Hur، نويسنده , , T.W. and Igarashi، نويسنده , , S. and Ikeda، نويسنده , , H. and Jeong، نويسنده , , H.C. and Kaneyuki، نويسنده , , K. and Kim، نويسنده , , D.Y. and Kim، نويسنده , , S.K. and Kuzmin، نويسنده , , A. and Lee، نويسنده , , M.H. and Noguchi، نويسنده , , S. and O، نويسنده ,
Abstract :
We studied the performance of a prototype electromagnetic calorimeter for the BELLE detector at the KEK proton synchrotron for an energy range of 0.25–3.5 GeV. The prototype consisted of an array of 6 × 5 CsI(Tl) crystals with 30 cm length (16.2 radiation lengths) and about 6 cm × 6 cm cross section. The scintillation light of each CsI(Tl) crystal was read out by two large-area PIN photodiodes and charge-sensitive preamplifiers attached at the rear face of the crystal. We measured the energy and position resolution for electrons and the eπ separation for two sets of matrix configurations: one corresponded to the center and the other to the edge of the barrel calorimeter. The overall performance measured by the test proves that the prototype calorimeter is satisfactory for the use in the BELLE detector.
