Sara A. Pozzi
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View article: Improved contraband detection using an experimentally optimized neutron active interrogation pulse structure
Improved contraband detection using an experimentally optimized neutron active interrogation pulse structure Open
View article: Neutron and Gamma Organic Glass Imager with Visualization using Augmented Reality
Neutron and Gamma Organic Glass Imager with Visualization using Augmented Reality Open
The ability to detect and image multiple radiation sources in a field of view is important in the nuclear non-proliferation and safeguards fields because it allows institutions like the International Atomic Energy Agency (IAEA) to efficien…
View article: Global Sensitivity Analysis of a Frequency Domain Reactor Noise Methodology using Welch's Method for the KRUSTY Experiment [Slides]
Global Sensitivity Analysis of a Frequency Domain Reactor Noise Methodology using Welch's Method for the KRUSTY Experiment [Slides] Open
View article: Neutron Leakage Spectra Sensitivity Simulations for PARADIGM [Poster]
Neutron Leakage Spectra Sensitivity Simulations for PARADIGM [Poster] Open
View article: Welch Method and Bootstrapping Applied to Subcritical Gamma Noise
Welch Method and Bootstrapping Applied to Subcritical Gamma Noise Open
We measured the prompt neutron decay constant α of the CROCUS zero-power reactor at the Swiss Federal Institute of Technology Lausanne using cross-power spectral density (CPSD) analysis of gamma-gamma correlations from two trans-stilbene o…
View article: A Simulation Pipeline for Fast Neutron Imaging And Spectroscopy Using Quantified Detector Attributes
A Simulation Pipeline for Fast Neutron Imaging And Spectroscopy Using Quantified Detector Attributes Open
View article: Investigation of Noise Detection Systems in the CROCUS Reactor from SANDcaStLE
Investigation of Noise Detection Systems in the CROCUS Reactor from SANDcaStLE Open
The need for accurate, non-invasive methods to monitor reactor kinetics motivated SANDcaStLE (Simultaneous Analysis of Noise Detectors and Spectroscopy of a Low-power Experiment) at the CROCUS zero-power reactor. This study compares variou…
View article: Towards the Direct Observation of Xenon-135 Poisoning in a Zero-Power Reactor via Gamma Spectroscopy
Towards the Direct Observation of Xenon-135 Poisoning in a Zero-Power Reactor via Gamma Spectroscopy Open
Xenon-135 (Xe-135) is a high-yield fission product with high neutron-capture cross section. it is a commonly encountered reactor reactivity poison. Direct observation of Xe in reactors typically relies on off-gas measurement techniques, wh…
View article: Detection of uranium-photofission neutrons with a <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:msup><mml:mi/><mml:mn>4</mml:mn></mml:msup><mml:mi>He</mml:mi></mml:math> scintillation detector
Detection of uranium-photofission neutrons with a scintillation detector Open
The use of photon active interrogation to detect special nuclear material has held significant theoretical promise, as the interrogating source particles, photons, are fundamentally different from one of the main signatures of special nucl…
View article: A 3D Dual-Particle Imaging Algorithm for Multiple Imagers
A 3D Dual-Particle Imaging Algorithm for Multiple Imagers Open
The ability to localize and image radiation sources has found use in various applications for nuclear nonproliferation practices, specifically in treaty verification, nuclear safeguards, and homeland security. Technologies that are capable…
View article: Examination of Digital-Delay Rossi-$\\alpha$ for <sup>252</sup>Cf-Driven Highly Enriched Uranium Using Organic Scintillators
Examination of Digital-Delay Rossi-$\\alpha$ for <sup>252</sup>Cf-Driven Highly Enriched Uranium Using Organic Scintillators Open
Neutron noise techniques constitute several analysis methods applicable to non-destructive assay. One technique is the Rossi-α method to calculate the prompt neutron decay constant (α) or its inverse, the prompt neutron period (1/α), for a…
View article: Dual-Particle Visualization with HoloLens 2 in an Inspection Scenario
Dual-Particle Visualization with HoloLens 2 in an Inspection Scenario Open
View article: Application of the Cohn-alpha Method on Bare Highly Enriched Uranium Using Organic Scintillators [Poster]
Application of the Cohn-alpha Method on Bare Highly Enriched Uranium Using Organic Scintillators [Poster] Open
The prompt neutron decay constant (α), can be used to calculate the lifetime of prompt fission chains within a multiplying system and verify reactor startup and shutdown. We analyze a fast, bare system consisting of highly enriched uranium…
View article: Neutron Spectroscopy of Plutonium using a Handheld Detection System
Neutron Spectroscopy of Plutonium using a Handheld Detection System Open
The ability to distinguish multiple forms of plutonium from one another, such as oxide and metal, is paramount to areas of nuclear nonproliferation and international safeguards. In its metal form, plutonium can be readily used in a nuclear…
View article: Gamma-ray imaging of Np-237 metal using an organic glass imager
Gamma-ray imaging of Np-237 metal using an organic glass imager Open
View article: Event-by-event Neutron-Gamma Multiplicity Correlations in 242Pu(sf)
Event-by-event Neutron-Gamma Multiplicity Correlations in 242Pu(sf) Open
View article: Correlated Fission Simulations with MCNP6.2 and MCNPX-PoliMi
Correlated Fission Simulations with MCNP6.2 and MCNPX-PoliMi Open
View article: An evaluation of Monte Carlo simulations of neutron multiplicity measurements of plutonium metal
An evaluation of Monte Carlo simulations of neutron multiplicity measurements of plutonium metal Open
In January 2009, Sandia National Laboratories conducted neutron multiplicity measurements of a polyethylene-reflected plutonium metal sphere. Over the past 3 years, those experiments have been collaboratively analyzed using Monte Carlo sim…
View article: Lexical Measurement of Teaching Qualities
Lexical Measurement of Teaching Qualities Open
Students often evaluate their professors' teaching, both formally (e.g., managed by the institution) and informally (e.g., on websites such as Rate My Professor). However, quantifying the students' views from their written comments about t…
View article: Neutron-Gamma Noise Measurements in a Zero-Power Reactor Using Organic Scintillators
Neutron-Gamma Noise Measurements in a Zero-Power Reactor Using Organic Scintillators Open
Noise measurements in light water reactor systems aid in generating validation data for integral point kinetic parameter predictions and generating monitoring parameters for reactor safety and safeguards. The CROCUS zero-power reactor has …
View article: Measurement of fragment-correlated $γ$-ray emission from $^{252}$Cf(sf)
Measurement of fragment-correlated $γ$-ray emission from $^{252}$Cf(sf) Open
This paper presents recent experimental results on the yield of prompt fission $γ$ rays from the spontaneous fission of $^{252}$Cf. We use an ionization chamber to tag fission events and measure the masses and kinetic energies of the fissi…
View article: New Experiments for Detecting Emissions from Fission
New Experiments for Detecting Emissions from Fission Open
Ensuring that nuclear science and technology is used solely for peaceful purposes is one of the most pressing challenges facing our society. The Consortium for Monitoring, Technology, and Verification (MTV) mission is to help meet this cha…
View article: Detection of Prompt Photofission Neutrons from U-238 with a He-4 Scintillation Detector.
Detection of Prompt Photofission Neutrons from U-238 with a He-4 Scintillation Detector. Open
View article: Preliminary verification of the MCNP perturbation and fixed-source tally sensitivity tools
Preliminary verification of the MCNP perturbation and fixed-source tally sensitivity tools Open
View article: Measurement of Photoneutrons from Depleted Uranium and Comparison Study Using MCNPX-PoliMi
Measurement of Photoneutrons from Depleted Uranium and Comparison Study Using MCNPX-PoliMi Open
High-energy photon interrogation is a nondestructive technique that is used to detect special nuclear materials and characterize nuclear waste. The development of such systems is complex and requires Monte Carlo simulations to optimize sys…
View article: Multiplicity counting using organic scintillators to distinguish neutron sources: An advanced teaching laboratory
Multiplicity counting using organic scintillators to distinguish neutron sources: An advanced teaching laboratory Open
In this advanced instructional laboratory, students explore complex detection systems and nondestructive assay techniques used in the field of nuclear physics. After setting up and calibrating a neutron detection system, students carry out…
View article: Prompt Photofission Neutron Detection in Depleted Uranium
Prompt Photofission Neutron Detection in Depleted Uranium Open
The detection of prompt photofission neutrons during active interrogation is a strong indication of the presence of special nuclear materials. However, the high-energy photons used for interrogation create a very challenging radiation envi…
View article: Comparison of NMC estimates with trans-stilbene, EJ-309, and He-3 detection systems
Comparison of NMC estimates with trans-stilbene, EJ-309, and He-3 detection systems Open
Neutron multiplicity counting (NMC) is a technique for the assay of fissile material. In this work, three detection systems are utilized for active interrogation assay of shells of the Rocky Flats shells (highly enriched uranium, 93% 235U)…
View article: A Verification of Flux Sensitivity Estimates Using the MCNP Tally Perturbation Tool
A Verification of Flux Sensitivity Estimates Using the MCNP Tally Perturbation Tool Open
Nuclear data is commonly used in applications such as nuclear nonproliferation, safeguards, and criticality safety. More specifically, nuclear data is used in predictive simulation codes like the Monte-Carlo N-Particle (MCNP®) t…
View article: Instrumentation for correlated prompt <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e157" altimg="si4.svg"><mml:mrow><mml:mi>n</mml:mi><mml:mo linebreak="goodbreak" linebreakstyle="after">−</mml:mo><mml:mi>γ</mml:mi></mml:mrow></mml:math> emission studies in coincidence with fission fragments
Instrumentation for correlated prompt emission studies in coincidence with fission fragments Open