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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

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

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

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

Publication year

2020

Confidentiality

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

Name of the periodical

Applied Radiation and Isotopes

ISSN

0969-8043

e-ISSN

—

Volume of the periodical

166

Issue of the periodical within the volume

December

Country of publishing house

GB - UNITED KINGDOM

Number of pages

7

Pages from-to

1-7

UT code for WoS article

000589093400014

EID of the result in the Scopus database

2-s2.0-85088891028