High-energy neutron emission in thermal neutron-induced fission of 235 U

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

High-energy neutron emission in thermal neutron-induced fission of 235 U

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

High-energy neutron emission in thermal neutron-induced fission of 235 U

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10304 - Nuclear 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

2024

Kód důvěrnosti údajů

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

Název periodika

Physical Review C

ISSN

2469-9985

e-ISSN

2469-9993

Svazek periodika

109

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

1-7

Kód UT WoS článku

001246550700005

EID výsledku v databázi Scopus

2-s2.0-85193700161