Photonuclear reactions, especially photofission delayed neutron emission, play an important role for
applications involving nuclear material detection. In order to provide good quality data for evaluations and data
libraries, an experimental programme of delayed neutron measurements has been undertaken for actinides with
Bremsstrahlung energy from 12 up to 20 MeV. In this paper, we report on delayed neutron yields and time spectra
characteristics from the photofission of 238U and 235U for several endpoint energies between 12 and 18.5 MeV. The
associated modelling efforts will be described including some calculations compared to experimental data.
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