Ratio of spectral averaged cross sections measured in 252-Cf(sf) and 235-U(nth,f) neutron fields

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A_____%2F20%3AN0000180" target="_blank" >RIV/26722445:_____/20:N0000180 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1051/epjconf/202023919004" target="_blank" >http://dx.doi.org/10.1051/epjconf/202023919004</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/epjconf/202023919004" target="_blank" >10.1051/epjconf/202023919004</a>

Result language

angličtina

Original language name

Ratio of spectral averaged cross sections measured in 252-Cf(sf) and 235-U(nth,f) neutron fields

Original language description

The results of systematic evaluations of spectrum averaged cross section (SACS) measurements in the fission neutron fields of 252-Cf and 235-U are presented. The data form a complete database of high-threshold experimental SACS measured in the same installation under the same conditions and using the same high purity germanium gamma spectrometer. This is crucial to reduce the uncertainty of the ratio and the data scattering and therefore, to minimize discrepancies compared to cross section measured under different conditions in different laboratories. This new dataset complements and extends earlier experimental evaluations.The total emission of the 252-Cf neutron source during the experiments varied from 9.5E8 to 4.5E8 neutrons per second. The emission was derived in accordance to the data in the Certificate of Calibration involving absolute flux measurements in a manganese sulphate bath. Concerning 235-U fission neutron field, the irradiations were carried out in a specifically designed core assembled in the zero power light water LR-0 reactor. This special core has well described neutron field. After the irradiation, the low volume irradiated samples to be measured by gamma spectrometry were placed directly on the upper cap of a coaxial high purity germanium (HPGe) detector in a vertical configuration (ORTEC GEM35P4). High volume samples were homogenized and strewn into the Marinelli beaker. HPGe detector is surrounded by the lead shielding box with a thin inner copper cladding and covered with rubber for suppression of background signal and bremsstrahlung. The experimental reaction rates were derived for irradiated samples from the Net Peak Areas (NPA) measured using the semiconductor HPGe detector. The measured reaction rates are used to derive the spectrum-averaged cross sections. Furthermore, measured reaction rates are also compared with MCNP6 calculations using various nuclear data libraries, in particular IRDFF 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

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

Article name in the collection

EPJ Web of Conferences 239, 19004 (2020)

ISBN

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ISSN

2100-014X

e-ISSN

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Number of pages

4

Pages from-to

1-4

Publisher name

EDP Sciences

Place of publication

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Event location

Beijing, China

Event date

May 19, 2019

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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