title: Measurement and calculation of fast neutron and gamma spectra in well defined cores in LR-0 reactor.
abstract: A well-defined neutron spectrum is essential for many types of experimental topics and is also important for both calibration and testing of spectrometric and dosimetric detectors. Provided it is well described, such a spectrum can also be employed as a reference neutron field that is suitable for validating selected cross sections. The present paper aims to compare calculations and measurements of such a well-defined spectra in geometrically similar cores of the LR-0 reactor with fuel containing slightly different enrichments (2%, 3.3% and 3.6%). The common feature to all cores is a centrally located dry channel which can be used for the insertion of studied materials. The calculation of neutron and gamma spectra was realized with the MCNP6 code using ENDF/B-VII.0, JEFF-3.1, JENDL-3.3, ROSFOND-2010 and CENDL-3.1 nuclear data libraries. Only minor differences in neutron and gamma spectra were found in the comparison of the presented reactor cores with different fuel enrichments. One exception is the gamma spectrum in the higher energy region (above 8MeV), where more pronounced variations could be observed.
authors.affiliation: Research Center Rez Ltd, 250 68 Husinec-Rez 130, Czechia. Electronic address: Michal.Kostal@cvrez.cz.
authors.forename: Michal
authors.initials: M
authors.lastname: Košťál
authors.affiliation: Masaryk University, Botanická 15, Brno612 00, Czechia.
authors.forename: Zdeněk
authors.initials: Z
authors.lastname: Matěj
authors.affiliation: University of Defence, Kounicova 65, Brno612 00, Czechia.
authors.forename: František
authors.initials: F
authors.lastname: Cvachovec
authors.affiliation: Research Center Rez Ltd, 250 68 Husinec-Rez 130, Czechia.
authors.forename: Vojtěch
authors.initials: V
authors.lastname: Rypar
authors.affiliation: Research Center Rez Ltd, 250 68 Husinec-Rez 130, Czechia.
authors.forename: Evžen
authors.initials: E
authors.lastname: Losa
authors.affiliation: Research Center Rez Ltd, 250 68 Husinec-Rez 130, Czechia.
authors.forename: Jiří
authors.initials: J
authors.lastname: Rejchrt
authors.affiliation: Masaryk University, Botanická 15, Brno612 00, Czechia.
authors.forename: Filip
authors.initials: F
authors.lastname: Mravec
authors.affiliation: Masaryk University, Botanická 15, Brno612 00, Czechia.
authors.forename: Martin
authors.initials: M
authors.lastname: Veškrna
keywords: Cross section validation; Detector calibration; LR-0; Neutron spectra; Reactor Dosimetry; Zero power reactor utilization