Author/Authors :
Albrow، نويسنده , , M. and Aota، نويسنده , , S. and Apollinari، نويسنده , , G. and Asakawa، نويسنده , , T. and Bailey، نويسنده , , M. and de Barbaro، نويسنده , , P. and Barnes، نويسنده , , Katherine V. and Benjamin، نويسنده , , D. and Biery، نويسنده , , K. and Blusk، نويسنده , , S. and Bodek، نويسنده , , A. and Bolla، نويسنده , , G. and Breccia، نويسنده , , L. and Brunetti، نويسنده , , R. and Budd، نويسنده , , H. and Cauz، نويسنده , , D. and Demortier، نويسنده ,
Abstract :
A preshower detector consisting of plastic scintillating plates with optical-fiber readout was tested at the Fermilab meson beamline. The detector was placed at a depth of about 1.5X0, followed by an electromagnetic and hadronic calorimeter, and exposed to positron, positively charged pion and positive muon beams with energies in the range of 5–227 GeV. Multianode phototubes, HAMAMATSU R5900-M16, were used for the photon readout. The efficiency for detecting two minimum ionizing particles with noise occupancy of <1% was 90–100% for gains of (1–4)×105. It was also found that by requiring an appropriately large signal in the preshower detector, the rate of charged pions depositing a large fraction of energy in the electromagnetic calorimeter could be reduced by a factor of 1.4–2.0 (1.4–2.8) while keeping 95% (90%) efficiency for positrons.
