Abstract
A high efficiency, associated gamma ray time of flight spectrometer for the study of (n, γ) angular correlations following (charged particle, n) reactions is described. The neutron detector employs eight XP1040 photomultiplier tubes viewing four tanks of NE213 liquid scintillator, and subtends a solid angle of 0.092 sterad at the target when the neutron flight path is two metres. Neutron events in the scintillator are identified by means of pulse shape discrimination. The use of constant fraction pulse height discriminators to provide fast timing pulses, enables the use of a wide dynamic pulse height range in both the neutron and gamma ray detectors. This method of timing enables the gamma ray detector to be changed from a Ge(Li) counter, to a NaI(Tl) or other type of scintillation detector with only a minimal rearrangement of the electronic system.
Published Version
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