Prospects for neutron flux monitoring of D-T sources by Na-23(n,2n)Na-22 reaction

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A_____%2F17%3AN0000059" target="_blank" >RIV/26722445:_____/17:N0000059 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/abs/pii/S0920379617302922" target="_blank" >https://www.sciencedirect.com/science/article/abs/pii/S0920379617302922</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.fusengdes.2017.03.077" target="_blank" >10.1016/j.fusengdes.2017.03.077</a>

Result language

angličtina

Original language name

Prospects for neutron flux monitoring of D-T sources by Na-23(n,2n)Na-22 reaction

Original language description

Current work in Research Centre Rez'focuses on the validation of potential neutron emission monitors of the volumetric D-T source based on the sealed tube design. The sealed tube source solution provides a relatively cheap and exact simulation of neutron energy and flux distribution, as expected in ITER, and is therefore convenient for neutron transport investigation through potential structural materials. The problem for absolute measurements is the inability to monitor the source emission precisely. It was proposed to use the Na-23(n,2n)(22)Nareaction which on the one hand produces Na-22 with a 2.6 y half-life and on the other hand, possesses a validated cross section which has been cross-compared with standard Au-197(n,gamma)Au-198 in a fission spectrum produced by the LR-0 reactor. In this paper, we show that the Na-23(n,2n)N-22 a reaction, despite its high threshold (12.96 MeV) is sensitive enough to produce measurable activities under irradiation at low power levels even in a fission spectrum. Based on this experiment it is estimated that a similar solution could work as well in the case of emission monitoring from a relatively weak sealed tube source with a maximum intensity approximate to 1 x 10(10) n/s. It can be stated that the results produced by calculation using different data libraries show large discrepancies with the experimentally determined reaction rates in the range up to 33.0%. The relatively large uncertainty in the nuclear data in a fission reactor spectrum could furnish an explanation, however the values of cross sections in a D-T spectrum have yet to be validated.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20305 - Nuclear related engineering; (nuclear physics to be 1.3);

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Fusion Engineering and Design

ISSN

0920-3796

e-ISSN

1873-7196

Volume of the periodical

123

Issue of the periodical within the volume

November

Country of publishing house

CH - SWITZERLAND

Number of pages

4

Pages from-to

915-918

UT code for WoS article

000418992000192

EID of the result in the Scopus database

2-s2.0-85015743500