Designs and neutronic characteristics of an epithermal neutron moderator at ambient temperature for neutron time-of-flight measurements

Compact time-of-flight (TOF) measurement systems are desirable for easy installation in various facilities. To achieve such compact systems, one of the key considerations is the design of the neutron moderator. Therefore, systematic studies on moderators considering both neutron energy resolution an...

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Veröffentlicht in:Journal of nuclear science and technology 2022-12, Vol.59 (12), p.1546-1557
Hauptverfasser: Lee, Jaehong, Ito, Fumiaki, Hironaka, Kota, Takahashi, Tone, Suzuki, Satoshi, Koizumi, Mitsuo
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container_end_page 1557
container_issue 12
container_start_page 1546
container_title Journal of nuclear science and technology
container_volume 59
creator Lee, Jaehong
Ito, Fumiaki
Hironaka, Kota
Takahashi, Tone
Suzuki, Satoshi
Koizumi, Mitsuo
description Compact time-of-flight (TOF) measurement systems are desirable for easy installation in various facilities. To achieve such compact systems, one of the key considerations is the design of the neutron moderator. Therefore, systematic studies on moderators considering both neutron energy resolution and neutron intensity are important. In this paper, to design an epithermal neutron moderator at ambient temperature for short-distance TOF measurements, the neutron intensity and energy resolution of epithermal neutrons have been studied using the Monte Carlo simulation code PHITS with JENDL-4.0 for various types of moderators. The neutronic characteristics of a moderator comprising several components were evaluated. The relationships between the moderator dimensions and both the energy resolution and intensity of the epithermal neutrons were determined. From the obtained results, the appropriate high-resolution moderator designs for the short-distance TOF measurements were proposed.
doi_str_mv 10.1080/00223131.2022.2077259
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subjects Ambient temperature
Energy resolution
epithermal neutron moderator
Fast neutrons
Moderators
Monte Carlo simulation
neutron intensity
Neutrons
Time measurement
time-of-flight (TOF)
title Designs and neutronic characteristics of an epithermal neutron moderator at ambient temperature for neutron time-of-flight measurements
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