Following J. Raynal’s DWBA and ECIS codes: coupled channels with microscopic non-local potential

Abstract

Jacques Raynal provided two powerful tools to the nuclear reaction community interested in scattering processes, namely the ECISxx and DWBAxx computer codes (xx standing for the version year), which are renowned for both their numerical efficiency and the numerous applications they cover. The purpose of this work is twofold. First, it extends the possibilities of calculation of microscopic optical and transition potentials compared to what is proposed in the DWBA code. Then, following previous work by Arellano [Phys Rev C 76:014616, 2007], we develop a method to deal with coupled-channel calculations with non-local ingredients. Both codes DWBA and ECIS, and numerous past discussions with their author, offered guidance to elaborate and to validate new results focusing on neutron scattering off spin-0 target. Special attention has been paid to match the numerical precision of J. Raynal's tools. This was made possible by using a specific quadrature method for numerical integrations of functions with discontinuous derivatives.

Jacques Raynal

“…-Studies of (p,n) reactions [49]; -Theory works for partial waves in nuclear scattering [50]; -Calculated nuclear data generated for reaction evaluation, using OMP and CC equations [16]; -Calculations of Wigner 3 j coefficients [51]; -Non-locality in OMPs for nucleon-nucleus scattering [52]; -CC analysis of the elastic scattering with exotic nuclei within OMP approach [53]; -Applications to proton-nucleus inelastic scattering [54]; -Developments of Raynal's DWBA code [55] and beyond ECIS and DWBA [56]; -Theory for low energy neutron incident reactions [57] and nucleon-induced inelastic scattering [58]; -CC analysis of elastic and inelastic scattering for the studies of giant resonance excitations; calculations of the sub-Coulomb fusion cross sections [15]; -CC effects in nucleus-nucleus inelastic scattering [59] and in heavy ion reactions [60].…”