Constraining high energy tail of U-235(n(th),f) prompt fission neutron spectrum

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A_____%2F20%3AN0000036" target="_blank" >RIV/26722445:_____/20:N0000036 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/abs/pii/S0969804320304632" target="_blank" >https://www.sciencedirect.com/science/article/abs/pii/S0969804320304632</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.apradiso.2020.109313" target="_blank" >10.1016/j.apradiso.2020.109313</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Constraining high energy tail of U-235(n(th),f) prompt fission neutron spectrum

Popis výsledku v původním jazyce

There is a lack of reliable experiments aiming at the prompt fission neutron spectrum of U-235 for energies higher than 10 MeV. The presented experiment performed at the LVR-15 light water reactor aimed at the measurement of very high threshold reactions spectral averaged cross sections such as Mn-55 (n,2n)Mn-54, Au-197 (n,2n)Au-196, Bi-209(n,3n)Bi-207, Bi-209(n,4n)Bi-206. Bi-209(n,3n)Bi-207 an Au-197 (n,3n)(195)All, a Bi-209(n,4n)Bi-206 reactions were measured for the first time. Ni-58(n,p)Co-58 reaction was used as a monitor reaction. The experimental spectral averaged cross sections are derived from reaction rates measured by means of high purity Germanium spectroscopy at the well defined detector. The experimental spectral averaged cross sections are compared with calculations using either ENDF/B-VIII.0 or JEFF-3.3( 235)U prompt fission neutron spectrum and IRDFF-II cross sections. The discrepancy is higher with higher mean response energy for JEFF-3.3 unlike ENDF/B-VIII.0, where the agreement is good within broad range of mean response energy. Moreover, due to the high thermal neutron flux in the reactor, the experimental reaction rate is compared with calculated( 195)Au (n,g)Au-199 reaction rate. The difference of -55.3% for double capture reaction was found in comparison with ROSFOND-2010 calculations.

Název v anglickém jazyce

Constraining high energy tail of U-235(n(th),f) prompt fission neutron spectrum

Popis výsledku anglicky

There is a lack of reliable experiments aiming at the prompt fission neutron spectrum of U-235 for energies higher than 10 MeV. The presented experiment performed at the LVR-15 light water reactor aimed at the measurement of very high threshold reactions spectral averaged cross sections such as Mn-55 (n,2n)Mn-54, Au-197 (n,2n)Au-196, Bi-209(n,3n)Bi-207, Bi-209(n,4n)Bi-206. Bi-209(n,3n)Bi-207 an Au-197 (n,3n)(195)All, a Bi-209(n,4n)Bi-206 reactions were measured for the first time. Ni-58(n,p)Co-58 reaction was used as a monitor reaction. The experimental spectral averaged cross sections are derived from reaction rates measured by means of high purity Germanium spectroscopy at the well defined detector. The experimental spectral averaged cross sections are compared with calculations using either ENDF/B-VIII.0 or JEFF-3.3( 235)U prompt fission neutron spectrum and IRDFF-II cross sections. The discrepancy is higher with higher mean response energy for JEFF-3.3 unlike ENDF/B-VIII.0, where the agreement is good within broad range of mean response energy. Moreover, due to the high thermal neutron flux in the reactor, the experimental reaction rate is compared with calculated( 195)Au (n,g)Au-199 reaction rate. The difference of -55.3% for double capture reaction was found in comparison with ROSFOND-2010 calculations.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

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

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Applied Radiation and Isotopes

ISSN

0969-8043

e-ISSN

—

Svazek periodika

166

Číslo periodika v rámci svazku

December

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

7

Strana od-do

1-7

Kód UT WoS článku

000589093400014

EID výsledku v databázi Scopus

2-s2.0-85088891028