A setup for precise measurement of resonance neutron capture by self-indication

Abstract In order to measure neutron capture self-indication in the neutron energy range up to 200 keV, a setup based on a 16-section NaI(Tl) scintillation gamma detector has been created at the 500-m flight path of the IBR-30 booster (JINR-Dubna). The detector has a geometric efficiency of 80% and a total scintillator volume of 36 1. The capture self-indication ratio T γ (n) for 238 U has been measured on the setup in the energy region 0.465–200 keV and in the range of filter thickness from 4.78 to 306 kb − . The setup can be used for investigations including resonance self-shielding effects as well as relations between gamma-quanta multiplicity and some resonance characteristics of nuclei.