Energy resolution of a lead scintillating fiber electromagnetic calorimeter

A calorimeter module was fabricated using profiled lead plates and scintillating fibers with diameter 1 mm and attenuation length about 80 cm. The absorber-to-fiber volume ratio was 1.17 and the module average radiation length X(sub 0) = 1.05 cm. The energy resolution of the module was investigated using the electron beams of U-70 at Serpukhov and of the SPS at CERN in the energy range 5-70 GeV. The energy resolution at theta = 3 deg (the angle between the fiber axis and the beam direction) may be expressed by the formula sigma/E(%) = 13.1/radical E + 1.7. The energy resolution was also simulated by Monte Carlo and good agreement with the experiment has been achieved.