Matthew J. Marcath

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A plutonium metal sample was measured by a fast-neutron multiplicity counter for characterization of spontaneous fission neutron anisotropy and for verification of MCNPX-PoliMi calculations. Accurate neutron angular distribution models are important to properly simulating fast neutron coincidence measurements for nuclear nonproliferation and safeguards(More)
The detection and characterization of highly enriched uranium (HEU) presents a large challenge in the non-proliferation field. HEU has a low neutron emission rate and most gamma rays are low energy and easily shielded. To address this challenge, an instrument known as the dual-particle imager (DPI) was used with a portable deuterium-tritium (DT) neutron(More)
Correlated neutrons from a Cf-252 spontaneous fission source were measured with a coincidence detection system. The system consisted of three EJ-309 cylindrical liquid scintillators (length and diameter of 7.62 cm) configured to quantify the effects of neutron cross-talk on the total observed correlated counts. Because scatter-based detectors are(More)
New event-by-event fission models have prompt neutron 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(More)
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