Abstract. In the framework of the OECD/NEA WPEC subgroup 41, ways to improve neutron induced capture cross sections for 241 Am and 237 Np are being sought. Decay data, energy dependent cross section data and neutron spectrum averaged data are important for that purpose and were investigated. New timeof-flight measurements were performed and analyzed, and considerable effort was put into development of methods for analysis of spectrum averaged data and re-analysis of existing experimental data.