SWANLOP : Scattering waves off nonlocal optical potentials in the presence of Coulomb interactions

TL;DR

SWANLOP is a computational package designed to accurately calculate scattering waves and observables for nucleon elastic collisions with spin-zero nuclei, effectively handling local and nonlocal potentials along with Coulomb interactions.

Contribution

The paper introduces SWANLOP, a novel, flexible code capable of solving scattering problems with nonlocal potentials and Coulomb forces in both momentum and coordinate spaces.

Findings

Accurate solutions for nucleon-nucleus scattering at energies up to 1.1 GeV.

Benchmark results demonstrating the code's precision.

Flexible handling of local and nonlocal potentials in different representations.

Abstract

We introduce the package SWANLOP to calculate scattering waves and corresponding observables for nucleon elastic collisions off spin-zero nuclei. The code is capable of handling local and nonlocal optical potentials superposed to long-range Coulomb interaction. Solutions to the implied Schr\"odinger integro-differential equation are obtained by solving an integral equation of Lippmann-Schwinger type for the scattering wavefunctions, $\psi=\phi_{C} + {G}_{C} {U}_{S}\psi$, providing and exact treatment to the Coulomb force [Phys. Lett. B 789, 256 (2019)]. The package has been developed to handle potentials either in momentum or coordinate representations, providing flexible options under each of them. The code is fully self-contained, being dimensioned to handle any $A\!\geq\!4$ target for nucleon beam energies of up to 1.1 GeV. Accuracy and benchmark applications are presented and discussed.