| Issue |
EPJ Web Conf.
Volume 338, 2025
ANIMMA 2025 – Advancements in Nuclear Instrumentation Measurement Methods and their Applications
|
|
|---|---|---|
| Article Number | 04029 | |
| Number of page(s) | 4 | |
| Section | Research Reactors and Particle Accelerators | |
| DOI | https://doi.org/10.1051/epjconf/202533804029 | |
| Published online | 06 November 2025 | |
https://doi.org/10.1051/epjconf/202533804029
Subcritical Neutron and Gamma Noise Measurements at the Seven Percent Critical Experiment (7uPCX)
1 Los Alamos National Laboratory, United States
2 Missouri University of Science and Technology, United States
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Published online: 6 November 2025
Abstract
As part of a collaborative international effort organized by Lawrence Livermore National Laboratory (LLNL), with key participants from L’Institut de radioprotection et de sûreté nucléaire (IRSN), Los Alamos National Laboratory (LANL), and Sandia National Laboratories (SNL), a series of high-multiplication subcritical neutron and gamma noise measurements were planned and executed. The primary aim of this research was to advance detector technology, assess the validity of gamma noise for subcriticality measurements, and nuclear criticality safety, focusing on collecting list-mode or time-series data from various reactor configurations with multiplication values ranging from 20 to 310. This comprehensive dataset enabled a detailed comparative analysis of multiple detector systems and the results of both neutron and gamma noise measurements. In this work we focus on experimentally comparing the results from neutron and gamma noise measurements. We note good agreement between estimations of the prompt neutron decay constant and demonstrate the effects of changing reactor geometry on the efficiency of the differing methods.
Key words: Criticality / Neutron Noise / Gamma Noise / Detectors / Cross Power Spectral Density
© The Authors, published by EDP Sciences, 2025
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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