Progress in the Evaluation and Validation of n+Fe-56,Fe-57 Cross Sections

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A_____%2F23%3AN0000047" target="_blank" >RIV/26722445:_____/23:N0000047 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.epj-conferences.org/articles/epjconf/abs/2023/10/epjconf_nd2023_12002/epjconf_nd2023_12002.html" target="_blank" >https://www.epj-conferences.org/articles/epjconf/abs/2023/10/epjconf_nd2023_12002/epjconf_nd2023_12002.html</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/epjconf/202328412002" target="_blank" >10.1051/epjconf/202328412002</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Progress in the Evaluation and Validation of n+Fe-56,Fe-57 Cross Sections

Popis výsledku v původním jazyce

There has been a continued effort since 2019 within the IAEA INDEN collaboration to improve the evaluation of neutron induced reactions on iron isotopes. The reason for the 30% underestimation of the neutron leakage spectrum from a thick iron sphere was found primarily to be due to the overestimation of the inelastic cross sections in the Fe-56 evaluated data file produced within the CIELO project of the OECD/NEA Data Bank. The over-estimation of the neutron flux between the resonances near 300 keV was traced to neglecting the fluctuating nature of the total cross section of Fe-57 in the fast neutron energy range, since the evaluated resolved resonance range of 57Fe extended only up to 190 keV. The added 14 background in the "iron window" below 28 keV is in excellent agreement with the independently evaluated one in the JENDL-5.0 library that included the direct capture component in the evaluation. Performance of the updated Fe-56,Fe-57 evaluations was tested on a set of criticality benchmarks from the ICSBEP Handbook, including the dependence on reflector thickness and on new deep penetration shielding benchmark using a Cf-252(sf) neutron source undertaken at Rez, Czech Republic. Neutron leakage for 43 MeV incident neutrons was also validated.

Název v anglickém jazyce

Progress in the Evaluation and Validation of n+Fe-56,Fe-57 Cross Sections

Popis výsledku anglicky

There has been a continued effort since 2019 within the IAEA INDEN collaboration to improve the evaluation of neutron induced reactions on iron isotopes. The reason for the 30% underestimation of the neutron leakage spectrum from a thick iron sphere was found primarily to be due to the overestimation of the inelastic cross sections in the Fe-56 evaluated data file produced within the CIELO project of the OECD/NEA Data Bank. The over-estimation of the neutron flux between the resonances near 300 keV was traced to neglecting the fluctuating nature of the total cross section of Fe-57 in the fast neutron energy range, since the evaluated resolved resonance range of 57Fe extended only up to 190 keV. The added 14 background in the "iron window" below 28 keV is in excellent agreement with the independently evaluated one in the JENDL-5.0 library that included the direct capture component in the evaluation. Performance of the updated Fe-56,Fe-57 evaluations was tested on a set of criticality benchmarks from the ICSBEP Handbook, including the dependence on reflector thickness and on new deep penetration shielding benchmark using a Cf-252(sf) neutron source undertaken at Rez, Czech Republic. Neutron leakage for 43 MeV incident neutrons was also validated.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

<a href="/cs/project/LM2023041" target="_blank" >LM2023041: České mezinárodní centrum výzkumných reaktorů</a><br>

Návaznosti

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

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název statě ve sborníku

15TH INTERNATIONAL CONFERENCE ON NUCLEAR DATA FOR SCIENCE AND TECHNOLOGY, ND2022

ISBN

—

ISSN

2100-014X

e-ISSN

—

Počet stran výsledku

8

Strana od-do

1-8

Název nakladatele

—

Místo vydání

—

Místo konání akce

online

Datum konání akce

21. 7. 2022

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

001006475600139