Two absolute integral measurements of the Au-197(n,γ) stellar cross-section and solution of the historic discrepancies
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EPJ Web of Conferences 239, 19002 (2020). [https://doi.org/10.1051/epjconf/202023919002]
SponsorshipSpanish projects (MINECO-FEDER,EU) FIS2015-69941-C2-1-P FPA2016-77689-C2-1-R; Spanish Association Against Cancer (AECC) PS16163811PORR; Programa Operativo FEDER Andalucia 2014-2020 A-FQM-371-UGR18
The Maxwellian averaged cross section (MACS) for Au-197(n,gamma) is used in neutron capture cross section measurements as a reference for reactions important for astrophysics, reactor and dosimetry applications. The traditionally adopted value for this reference cross section, in the energy range relevant for astrophysical (3 < E (n) < 200 keV), was obtained by Ratynski and Kappeler in 1988. However, the MACS calculated using the 2006 standards evaluation is approximately 6 % above the Ratynski and Kappeler (R&K) evaluation. Because of this discrepancy new experiments and reanalyses were done in an attempt to resolve the problem. In 2011 we started as well a series of integral experiments (activation) for determining the MACS -30 (kT=30 keV) of Au with two different Maxwellian neutron spectra: i) QMNS-25 (as R&K) and ii) MNS-30 (new method). Our results agree with those obtained with the standard evaluation. At present (2018), the updated MACS -30 has been included as standard Here we present the results of our measurements and the reasons for the lower value of the R&K measurement.