Delayed Neutron and Delayed Photon Characteristics from Photofission of Actinides

Delayed neutron (DN) and delayed photon (DP) emissions from photofission reactions play an important role for applications involving nuclear material detection and characterization. To provide new, accurate, basic nuclear data for evaluations and data libraries, an experimental programme of DN and DP measurements has been undertaken for actinides with bremsstrahlung endpoint energy in the giant resonance region (similar to 15 MeV). In this paper, the experimental setup and the data analysis method will be described. Experimental results for DN and DP characteristics will be presented for Th-232, U-235,U-238, Np-237 and Pu-239. Finally, an example of an application to study the contents of nuclear waste packages will be briefly discussed.