Abstract
We have developed a detector for high energy (≈ 20−400 MeV) gamma-rays resulting from relativistic heavy-ion collisions. The system consists of an array of lead-glass blocks, along with an arrangement of plastic scintillators and a plastic Cherenkov detector. By using RCAs “teacup dynode” phototubes, we have achieved an energy resolution significantly superior to any previously reported: the fwhm of the measured energy distribution for electrons entering the array is ∼5.7% E ( GeV) . The problem of neutron background required especially careful consideration in the design, and we describe measurement techniques for insuring a clean photon signal. We have calibrated the system at the LLNL electron linac, and we mention a simple and convenient method of obtaining a tagged photon beam.
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