Eur. Phys. J. A (2017) 53: 88
https://doi.org/10.1140/epja/i2017-12268-7

Regular Article - Theoretical Physics

Asymmetry dependence of Gogny-based optical potential

¹ CEA, DAM, DIF, F-91297, Arpajon, France
² Department of Physics - FCFM, University of Chile, Av. Blanco Encalada 2008, Santiago, Chile

^* e-mail: guillaume.blanchon@cea.fr

Received: 1 December 2016
Accepted: 2 April 2017
Published online: 11 May 2017

Abstract

An analysis of neutron and proton scattering off ^40,48Ca has been carried out. Real and imaginary potentials have been generated using the Nuclear Structure Method (NSM) for scattering with the Gogny D1S nucleon-nucleon effective interaction. Observables are well described by NSM for neutron and proton elastic scattering off ⁴⁰Ca and for neutron scattering off ⁴⁸Ca . For proton scattering off ⁴⁸Ca, NSM yields a lack of absorption. This discrepancy is attributed to two-fold charge exchange (p, n, p) contribution and coupling to Gamow-Teller mode which are not included in the present version of NSM. A recipe based on a Perey-Buck fit of the NSM imaginary potential and Lane model is proposed to overcome this issue in an approximate way.