Anticoincidence Shielded Gamma-Ray Spectrometer for Nuclear Reaction Studies

Abstract
A scintillation spectrometer has been built utilizing a modular liquid scintillation anticoincidence shield for a 12.7 cm diameter by 25.4 cm long NaI(Tl) detector crystal. The effectiveness of the anticoincidence shield is enhanced by storing in one-half of a multichannel analyzer memory those pulses from the NaI(Tl) crystal which are coincident with shield pulses. A fraction of this coincident spectrum is then subtracted from the anticoincident spectrum as a correction for shield inefficiency. A computer system is used for data handling. Spectral response for gamma radiation from 0.35 to 17.6 MeV has been measured.