Speaker:
Hugo F. Arellano, Department of Physics - FCFM - University of Chile
Abstract:
Nonlocality is an inherent feature of quantum systems involving fermionic constituents. In the context of nucleon-nucleus collisions, in the early 60s Perey and Buck introduced a phenomenological non-local form factor to be folded with local potentials, obtaining better descriptions of scattering data relative to those based on local potentials. The model remains restricted to beam energies of up to 40 MeV. It took about sixty years to establish a quantitative link between the bare NN interaction and the separable form of the optical potential introduced by Perey and Buck [EPJA.58:119(2022)]. These findings are based on microscopic calculations of optical model potentials using realistic NN interactions. It is found that the potential takes a factorized structure in momentum space, allowing to isolate the non-locality form factor. Ongoing research has lead to further extend the separable structure of the optical potential up to 400 MeV. Additionally, it has been found that non-locality form factor is not Gaussian but, to lowest order, of hydrogenic type. In this talk an overview of elements involved in microscopic descriptions of nucleon-nucleus processes will be presented, together with new findings on the non-local structure in the optical model.
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Open to all IP2I members, as well as UCBL and CNRS students and collaborators.
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