High-energy neutron emission in thermal neutron-induced fission of 235 U
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A_____%2F24%3AN0000019" target="_blank" >RIV/26722445:_____/24:N0000019 - isvavai.cz</a>
Result on the web
<a href="https://journals.aps.org/prc/abstract/10.1103/PhysRevC.109.054616" target="_blank" >https://journals.aps.org/prc/abstract/10.1103/PhysRevC.109.054616</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevC.109.054616" target="_blank" >10.1103/PhysRevC.109.054616</a>
Alternative languages
Result language
angličtina
Original language name
High-energy neutron emission in thermal neutron-induced fission of 235 U
Original language description
Spectrum-averaged cross-section (SACS) ratio measurement showing reduced uncertainties of measured SACS in two independent fission neutron fields is presented. The used prompt fission neutron fields correspond to the 252Cf(sf) and 235U(nth,f) fission neutrons. The employed SACS in the 235U(nth,f) prompt fission neutron spectrum (PFNS) were measured using three different light water reactors: LR-0 and VR-1 zero power reactors and the LVR-15 10 MWt reactor. The employed SACS in the 252Cf(sf) prompt fission neutron field were measured using a certified high-flux neutron source. Existing correlations among measured SACS in the two different neutron fields are estimated and used to reduce the uncertainty of measured SACS ratio for IRDFF dosimetry reactions. The derived set of measured SACS ratios with reduced uncertainty extends previous works into the higher-energy fission neutron range up to 20–30 MeV. The SACS ratio in 252Cf(sf) and 235U(nth,f) PFNS can be used to probe the high-energy tail of the 235U(nth,f) fission neutron spectrum as the 252Cf(sf) reference neutron spectrum is relatively well known. Derived experimental SACS ratio data. featuring low uncertainty are compared to the calculated dosimetry SACS ratio using the IRDFF-II dosimetry cross sections and the 235U(nth,f) ENDF/B-VII.1, ENDF/B-VIII.0, or JEFF-3.3 PFNS evaluations. The ENDF/B-VIII.0 evaluation of the 235U(nth,f) PFNS agrees well with derived SACS ratio data within quoted uncertainties. Other libraries predict a significantly lower fraction of 235U(nth,f) fission neutrons above 11 MeV of the outgoing neutron energy.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10304 - Nuclear physics
Result continuities
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)
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review C
ISSN
2469-9985
e-ISSN
2469-9993
Volume of the periodical
109
Issue of the periodical within the volume
5
Country of publishing house
US - UNITED STATES
Number of pages
7
Pages from-to
1-7
UT code for WoS article
001246550700005
EID of the result in the Scopus database
2-s2.0-85193700161