Author/Authors :
Ishikawa، نويسنده , , T. and Fujimura، نويسنده , , H. and Hashimoto، نويسنده , , R. and Kaida، نويسنده , , S. and Kasagi، نويسنده , , J. and Kitazawa، نويسنده , , R. and Kuwasaki، نويسنده , , S. and Nakamura، نويسنده , , A. and Nawa، نويسنده , , K. and Okada، نويسنده , , Y. and Sato، نويسنده , , M. and Shimizu، نويسنده , , H. and Suzuki، نويسنده , , Tadasu K. and Tajima، نويسنده , , Y. and Takahashi، نويسنده , , S. and Tsuchikawa، نويسنده , , Y. and ، نويسنده ,
Abstract :
A performance test has been made for an electro-magnetic calorimeter prototype comprised four identical BSO crystals arranged in a 2×2 matrix by utilizing a positron beam in the energy range from 100 to 800 MeV. The size of each crystal is 40×40×210 mm3. This is the worldʹs largest BSO single crystal ever used as a photon detector. The obtained energy resolution is ( σ E / E ) 2 = ( ( 1.71 % ± 0.03 % ) / E ) 2 + ( 1.12 % ± 0.08 % ) 2 at room temperature, where E is the incident positron energy given in GeV. A BGO calorimeter having the same geometry has been employed in the performance test for comparison. The basic scintillation characteristics of BSO crystals measured without the beam are also presented.
