Specification for pair spectrometer hodoscopes

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The fist paragraphs describe the pair spectrometer hodoscope in Hall B (Primex spectrometer). Electrons and positrons produced in a thin converter foil and deflected in the 1.5Tm dipole magnet are momentum analyzed using a symmetric set of 16 scintillators on each side. The scintillators are positioned in two layers of 8 counters each allowing for front-back coincidences.