Measurements and simulations to investigate the feasibility of neutron multiplicity counting in the current mode of fission chambers
In two earlier papers [1], [2] we investigated the possibility of extracting traditional multiplicity count rates from the cumulants of fission chamber signals in current mode. It was shown that if all neutrons emitted from the sample simultaneously are also detected simultaneously, the multiplicity...
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doaj-37e39f301ada4408a793ec8dc56e24bd2021-08-02T13:09:55ZengEDP SciencesEPJ Web of Conferences2100-014X2020-01-012250701110.1051/epjconf/202022507011epjconf_animma2019_07011Measurements and simulations to investigate the feasibility of neutron multiplicity counting in the current mode of fission chambersNagy LajosPázsit ImrePál LénárdKlujber GergelySzieberth MátéIn two earlier papers [1], [2] we investigated the possibility of extracting traditional multiplicity count rates from the cumulants of fission chamber signals in current mode. It was shown that if all neutrons emitted from the sample simultaneously are also detected simultaneously, the multiplicity rates can be retrieved from the first three cumulants of the currents of up to three detectors, but the method breaks down if the detections of neutrons of common origin take place with a time delay spread wider than the pulse shape. To remedy these shortcomings, in this work we extended the theory to two- and three-point distributions (correlations). It was found thatthe integrals of suitably chosen two- and three-point moments with respect to the time differences become independent of the probability density of the time delays of detections. With this procedure, the multiplicity rates can be retrieved from the detector currents for arbitrary time delay distributions. To demonstrate the practical applicability of the proposed method, a measurement setup was designed and built. The statistics (shape and amplitude distribution) of the detector pulse were investigated as important parameters of the theoretical model. Simulations were performed to estimate the expected value of the multiplicity rates in the built setup. Measurements were performed and two types of moments (the mean and the covariance function) of the recorded detector signals were calculated. Values of singles rates were successfully recovered.https://www.epj-conferences.org/articles/epjconf/pdf/2020/01/epjconf_animma2019_07011.pdfnuclear safeguardsmultiplicity countingfission chambers |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Nagy Lajos Pázsit Imre Pál Lénárd Klujber Gergely Szieberth Máté |
spellingShingle |
Nagy Lajos Pázsit Imre Pál Lénárd Klujber Gergely Szieberth Máté Measurements and simulations to investigate the feasibility of neutron multiplicity counting in the current mode of fission chambers EPJ Web of Conferences nuclear safeguards multiplicity counting fission chambers |
author_facet |
Nagy Lajos Pázsit Imre Pál Lénárd Klujber Gergely Szieberth Máté |
author_sort |
Nagy Lajos |
title |
Measurements and simulations to investigate the feasibility of neutron multiplicity counting in the current mode of fission chambers |
title_short |
Measurements and simulations to investigate the feasibility of neutron multiplicity counting in the current mode of fission chambers |
title_full |
Measurements and simulations to investigate the feasibility of neutron multiplicity counting in the current mode of fission chambers |
title_fullStr |
Measurements and simulations to investigate the feasibility of neutron multiplicity counting in the current mode of fission chambers |
title_full_unstemmed |
Measurements and simulations to investigate the feasibility of neutron multiplicity counting in the current mode of fission chambers |
title_sort |
measurements and simulations to investigate the feasibility of neutron multiplicity counting in the current mode of fission chambers |
publisher |
EDP Sciences |
series |
EPJ Web of Conferences |
issn |
2100-014X |
publishDate |
2020-01-01 |
description |
In two earlier papers [1], [2] we investigated the possibility of extracting traditional multiplicity count rates from the cumulants of fission chamber signals in current mode. It was shown that if all neutrons emitted from the sample simultaneously are also detected simultaneously, the multiplicity rates can be retrieved from the first three cumulants of the currents of up to three detectors, but the method breaks down if the detections of neutrons of common origin take place with a time delay spread wider than the pulse shape. To remedy these shortcomings, in this work we extended the theory to two- and three-point distributions (correlations). It was found thatthe integrals of suitably chosen two- and three-point moments with respect to the time differences become independent of the probability density of the time delays of detections. With this procedure, the multiplicity rates can be retrieved from the detector currents for arbitrary time delay distributions. To demonstrate the practical applicability of the proposed method, a measurement setup was designed and built. The statistics (shape and amplitude distribution) of the detector pulse were investigated as important parameters of the theoretical model. Simulations were performed to estimate the expected value of the multiplicity rates in the built setup. Measurements were performed and two types of moments (the mean and the covariance function) of the recorded detector signals were calculated. Values of singles rates were successfully recovered. |
topic |
nuclear safeguards multiplicity counting fission chambers |
url |
https://www.epj-conferences.org/articles/epjconf/pdf/2020/01/epjconf_animma2019_07011.pdf |
work_keys_str_mv |
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