Abstract
A 8Be identifier consisting of a divided collimator, a transmission ( ΔE) detector and a position-sensitive E detector has been designed. A solid angle of ≈6 msr is subtended, providing efficient detection of 35–70 MeV 8Be events. Both a simple identifier, employing a single ΔE detector, and a modified identifier, using twin transmission detectors with subnanosecond pile-up rejection, are described in detail. On light targets ( A⩽16), 400 keV 8Be energy resolution was obtained at a high counting rate (50 kcps). The smallest absolute cross sections observable were, at 20 kcps, 1 μb/sr c.m. (simple identifier) and, at 50 kcps, 0.1 μb/sr c.m. (modified identifier). Results from solid and gas targets are discussed.
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