Measurement of the 23Na(n,2n) cross section in 235U and 252Cf fission neutron spectraMichal Košťál, Martin Schulc, Vojtěch Rypar, Evžen Losa, Marie Švadlenková, Petr Baroň, Bohumil Jánský, Evžen Novák, Martin Mareček and Jan UhlířEPJ Web Conf., 146 (2017) 04045DOI: https://doi.org/10.1051/epjconf/201714604045