Abstract
Direct inelastic scattering to discrete excitations and pre-equilibrium emission are described within a microscopic model. Nuclear structure information are obtained in the (Quasi) Random Phase Approximation ((Q)RPA) framework implemented with the Gogny force. The relevant optical and transition potentials are build considering the JLM folding model. Various successful applications are shown for (n,n), (n,n'), (n,x n) and (n,x nγ) reactions for spherical and axially deformed even-even or odd targets. The rearrangement corrections to transition potentials and the contribution of unnatural parity excitations to pre-equilibrium emission are discussed. Our model predictions for (n,n'γ) reactions, for intra- and inter-band transitions in 238 U, and for the 239 Pu(n,2n) cross section are analyzed.
Highlights
Energy production, nuclear waste management, isotope production for medicine, modeling of nucleo-synthesis, all require a precise knowledge of cross sections for various light incoming and outgoing particles for target nuclei spanning the whole mass table
Microscopic modeling of neutron induced reaction on actinides could help in better determining observables which still cannot be well constrained by measurements, such as the 238U(n,n’) and 239Pu(n,2n) cross sections
Microscopic calculations of neutron direct and preequilibrium emission from spherical and axially deformed nuclei were performed, relying on the JLM folding model and (Q)RPA nuclear structure ingredients calculated with Gogny forces
Summary
Nuclear waste management, isotope production for medicine, modeling of nucleo-synthesis, all require a precise knowledge of cross sections for various light incoming and outgoing particles for target nuclei spanning the whole mass table. We report here recent progresses we made in the modeling of direct and pre-equilibrium reactions starting from a microscopic description of target excitations. New cross section measurements of the (n,n’γ ) reactions [1,2,3,4] provide new challenges to the modeling of various reaction mechanisms. Microscopic modeling of neutron induced reaction on actinides could help in better determining observables which still cannot be well constrained by measurements, such as the 238U(n,n’) and 239Pu(n,2n) cross sections. To assess the accuracy of our modeling, we demonstrate its ability to describe direct inelastic scattering to discrete excitations in 208Pb, illustrating the impact of rearrangement corrections on the predicted cross sections. We discuss the direct pre-equilibrium calculation for the 208Pb(n,xn) reaction, focusing on the contribution of non natural parity excitations to the neutron emission.
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