Abstract
New event-by-event fission models have prompt neutrons and gamma-rays that are correlated in time, energy, and multiplicity, however there is limited measurement data available to validate these models. Measurement of high-order fission neutron and gamma-ray coincidences is difficult and there has previously been little motivation to measure properties of both particle types simultaneously. High-order Cf-252 spontaneous fission neutron and gamma-ray coincidences were measured with a cylindrical array of 22 liquid organic and 8 NaI(Tl) scintillation detectors, 50 cm from a central axis. Waveforms were acquired and saved for post-processing using four time-synchronized CAEN V1720 digitizers. Liquid organic scintillator waveforms were analyzed with off-line pulse shape discrimination techniques to categorize neutron and gamma-ray detections. Detected multiplicity was compared with MCNPX-PoliMi simulation results, where built-in fission models and event-by-event fission models, CGMF and FREYA, have been implemented. Additionally, measured neutron energy by time-of-flight and gamma-ray energy correlated by detected multiplicity were compared to simulated results.
Highlights
Improved understanding of prompt fission emissions could lead to new safeguards and verification measurement techniques
Many studies of prompt emissions have already been done, exclusive to one particle type; this work seeks to characterize the correlation between Cf252 spontaneous fission neutrons and gamma-rays and to compare simulated results, with various fission models invoked, to measured results
The event-byevent CGMF and FREYA algorithms handle the transition from primarily neutron emission to gamma-ray emission differently resulting in differences in observed particle correlations
Summary
Improved understanding of prompt fission emissions could lead to new safeguards and verification measurement techniques. The physics community is motivated to improve the theory of prompt neutron and gammaray emission, to characterize correlation between those particles. Developed event-byevent physics based models CGMF and FREYA make predictions of correlations [1, 2], which can be tested. Many studies of prompt emissions have already been done, exclusive to one particle type; this work seeks to characterize the correlation between Cf252 spontaneous fission neutrons and gamma-rays and to compare simulated results, with various fission models invoked, to measured results
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