Validation of heavy water cross section using AmBe neutron source

¹ Research Centre Rez, Hlavni 130, Husinec-Rez, Czech Republic
² Masaryk University, Botanická 15, Brno 612 00, Czech Republic
³ University of Defence, Kounicova 65, Brno 612 00, Czech Republic
⁴ Institut de Radioprotection et de Sureté Nucléaire, 31 Avenure de la Division le Clerc, 92262 Fonenay-aux-Roses, FRANCE

^* e-mail: michal.kostal@cvrez.cz
^** e-mail: martin.schulc@cvrez.cz

Published online: 30 September 2020

Abstract

Physical quantities derived from integral experiments can usually be measured much more accurately than that from differential nuclear data. The accurate knowledge of integral parameters provide excellent grounds for testing and tuning differential data such as, for instance, cross sections. Measurement of neutron leakage spectra with ²⁵²Cf neutron source located at sphere center is often used for integral experiments. While this type of experiments provide information for cross section tuning, however, care must be taken to avoid misleading interpretation, namely, at high energies due to the very low portion of high energy neutrons in ²⁵²Cf spectrum. This issue can be alleviated by the use of point source with different spectra shape. For that purpose one suitable candidate seems to be the AmBe neutron source which has a relatively high average energy and peak character of emitted neutrons. Indeed, AmBe seems an interesting option because the calculated leakage neutron spectra are not very sensitive to the input shape of the neutron spectra. Thus the neutron leakage spectra calculated using tabulated of International Organization for Standardization spectra is nearly the same as stilbene measured AmBe spectra as an input.