A MULTIPLICITY DETECTOR FOR ACCURATE LOW-ENERGY CAPTURE MEASUREMENTRensselaer Polytechnic Institute Troy, New York 12180-3590, USA N.J. Drindak, F. Feiner, K.W. Seeman and R.E. Slovacek Knolls Atomic Power Laboratory P.O. Box 1072, Schenectady, New York 12301, USA A 16-segment NaI gamma multiplicity detector has been set up at the 25-m flight station of the Rensselaer Polytechnic Linear Accelerator Laboratory that is designed for accurate low-energy capture measurements. The detector consists of two 10-liter annuli of NaI placed coaxially and end-to-end, with each annulus optically divided into eight pie-shaped segments with a photomultiplier coupled to each segment. Capture data are recorded as a function of the multiplicity of the event (1 to 16) and the total gamma energy deposited into the NaI system. Multiplicity data for thermal neutron capture in Au and Cd are presented. KEYWORDS: Neutron Capture detector, gamma ray multiplicity spectra |