Spectral averaged cross sections as a probe to a high energy tail of U-235 PFNS

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A_____%2F23%3AN0000048" target="_blank" >RIV/26722445:_____/23:N0000048 - isvavai.cz</a>

Result on the web

<a href="https://www.epj-conferences.org/articles/epjconf/abs/2023/10/epjconf_nd2023_04021/epjconf_nd2023_04021.html" target="_blank" >https://www.epj-conferences.org/articles/epjconf/abs/2023/10/epjconf_nd2023_04021/epjconf_nd2023_04021.html</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/epjconf/202328404021" target="_blank" >10.1051/epjconf/202328404021</a>

Result language

angličtina

Original language name

Spectral averaged cross sections as a probe to a high energy tail of U-235 PFNS

Original language description

The systematic evaluations of spectrum averaged cross sections of dosimetric reactions over a broad range of energies were performed in Cf-252 (spontaneous fission) and U-235(nth,f) neutron fields. The neutron sources used in this study were LR-0, VR-1 zero power research light water reactors, LVR-15 10 MW research light water reactor, and Cf-252 neutron source with emission specified precisely by the manganese sulphate bath. All spectral averaged cross sections were inferred from measured reaction rates which were derived from gamma spectrometry. These gamma spectrometry measurements were performed using a single detector in all cases. The ratios of Cf-252 and U-235 spectral averaged cross sections can be used to specify the high energy tail of the U-235 prompt fission neutron spectrum as the Cf-252 spontaneous fission spectrum is considered as a standard. Furthermore, ratios are independent of cross section uncertainties since uncertainties in the cross sections are eliminated. Theoretical models of fission can be tested based on our measurements. The calculations were performed in MCNP6.2 transport code using different prompt fission neutron spectra and IRDFF-II cross sections for threshold reactions. The ratios are in good agreement using only ENDF/B-VIII.0 235U prompt fission neutron spectrum suggesting it to be harder than in other evaluations.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

10303 - Particles and field physics

Project

<a href="/en/project/LM2023041" target="_blank" >LM2023041: Czech International Centre of Research Reactors</a><br>

Continuities

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

Publication year

2023

Confidentiality

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

Article name in the collection

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

ISBN

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ISSN

2100-014X

e-ISSN

—

Number of pages

4

Pages from-to

1-4

Publisher name

—

Place of publication

—

Event location

online

Event date

Jul 21, 2022

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

001006475600098