Criticality experiments and benchmarks for cross section evaluation: the neptunium case L.S. Leong, L. Tassan–Got, L. Audouin, C. Paradela, J.N. Wilson, D. Tarrio, B. Berthier, I. Duran, C. Le Naour and C. Stéphan EPJ Web of Conferences, 42 (2013) 05003 Published online: 18 March 2013 DOI: 10.1051/epjconf/20134205003