Design study of DESCANT: DEuterated SCintillator Array for Neutron Tagging

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Wong, James
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University of Guelph

A novel neutron tagging array is being developed for the study of high-spin states of neutron-rich systems. This ground-breaking design will be based upon an array of liquid deuterated scintillators for neutron detectors and is called the DEuterated SCintillator Array for Neutron Tagging or DESCANT. DESCANT will serve as an auxiliary detector for the TIGRESS spectrometer located at TRIUMF's ISAC radioactive ion beam facility. Neutron spectroscopy is typically performed by utilizing time-of-flight (TOF) techniques. However, the multiple scattering of neutrons between detectors poses a major problem to overcome and is commonly dealt with by vetoing signals collected in adjacent detectors. This results in a much reduced detection efficiency for higher neutron multiplicity events. Fast neutron scattering from deuterium is not isotropic in the centre-of-mass frame and the measured pulse-height spectra is forward-peaked. This pulse-height information can be correlated with the TOF to overdetermine the neutron energy, thus rejecting multiple scattering without the need to veto nearest neighbours. Results from early feasibility tests will be presented, along with the status of GEANT4 simulations of the array performance. The fully close-packed array consists of 70 pseudo-hexaconical neutron detector units 150 mm high. DESCANT subtends an angle of [theta] = 65.5° and covers 92.6% of this solid angle or 1.08[pi] sr.

DESCANT, Deuterated Scintillator Array for Neutron Tagging, neutron tagging array, high-spin states, neutron-rich systems