Study of photon strength function of actinides: the case of 235-U, 238-Np and 241-Pu
2011
The decay from excited levels in medium and heavy nuclei can be described in a statistical
approach by means of Photon Strength Functions and Level Density distributions. The study of
electromagnetic cascades following neutron capture based on the use of high e ciency detectors
has been shown to be well suited for probing the properties of the Photon Strength Function of
heavy (high level density) and/or radioactive (high background) nuclei. In this work we have
investigated for the rst time the validity of the recommended PSF of actinides, in particular 235U,
238Np and 241Pu. Our study includes the search for resonance structures in the PSF below Sn and
draws conclusions regarding their existence and their characteristics in terms of energy, width and
electromagnetic nature.
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