Abstract

A magnet-less spectrometer consisting of a point hydrogen target and a scintillation counter hodoscope is described. Recoil protons are selected on the basis of range, time-of-flight, and pulse height. The hodoscope measures the recoil angle in the region of the Jacobian peak. The incident proton momentum, which varies in each event, is measured at each trigger time. Data are displayed directly on a 2-dimensional pulse height analyser, one dimension being the recoil angle, the other the incident momentum, the combination of these giving the mass spectrum.

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