Supersymmetric inversion of effective-range expansions

TL;DR

This paper introduces a novel, precise method for deriving interaction potentials from experimental scattering data using effective-range functions and supersymmetric transformations, demonstrated on neutron-proton scattering.

Contribution

It presents a complete inversion technique combining effective-range expansion and supersymmetric quantum mechanics to accurately reconstruct interaction potentials from scattering data.

Findings

High-precision fitting of phase shifts over large energy ranges

Successful application to neutron-proton scattering data

Accurate potential reconstruction using supersymmetric methods

Abstract

A complete and consistent inversion technique is proposed to derive an accurate interaction potential from an effective-range function for a given partial wave in the neutral case. First, the effective-range function is Taylor or Pad\'e expanded, which allows high precision fitting of the experimental scattering phase shifts with a minimal number of parameters on a large energy range. Second, the corresponding poles of the scattering matrix are extracted in the complex wave-number plane. Third, the interaction potential is constructed with supersymmetric transformations of the radial Schr\"odinger equation. As an illustration, the method is applied to the experimental phase shifts of the neutron-proton elastic scattering in the $^1S_0$ and $^1D_2$ channels on the $[0-350]$ MeV laboratory energy interval.