Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 807, Issue -, Pages 69-78Publisher
ELSEVIER
DOI: 10.1016/j.nima.2015.10.082
Keywords
Beta-delayed neutron emission probability; Neutron and beta counters; Self-triggered digital data acquisition system; Geant4 simulations
Categories
Funding
- Spanish Ministerio de Economia y Competitividad [FPA2008-06419, FPA2011-24553, PRI-PIMNUP-2011-1348 FPA2011-28770-C03-03, FPA2014-52823-C2]
- STFC (UK)
- Academy of Finland under the Finnish Centre of Excellence Programme
- STFC [ST/G000751/1, ST/J000051/1, NuSTAR, ST/L005743/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/G000751/1, ST/G000751/1 NuSTAR, ST/L005743/1, NuSTAR, ST/J000051/1] Funding Source: researchfish
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A new detection system for the measurement of beta-delayed neutron emission probabilities has been characterized using fission products with well known beta-delayed neutron emission properties. The setup consists of BELEN-20, a 4 pi-neutron counter with twenty He-3 proportional tubes arranged inside a large polyethylene neutron moderator, a thin Si detector for beta counting and a self-triggering digital data acquisition system. The use of delayed-neutron precursors with different neutron emission windows allowed the study of the effect of energy dependency on neutron, beta and beta-neutron rates. The observed effect is well reproduced by Monte Carlo simulations. The impact of this dependency on the accuracy of neutron emission probabilities is discussed. A new accurate value of the neutron emission probability for the important delayed-neutron precursor I-137 was obtained, P-n = 7.76(14)%. (C) 2015 Elsevier B.V. All rights reserved.
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