Covariant spectator theory of np scattering: Phase shifts obtained from precision fits to data below 350 MeV

TL;DR

This paper develops covariant models for neutron-proton scattering using the spectator theory, fitting extensive data below 350 MeV with high precision and providing updated phase shifts useful for nuclear physics research.

Contribution

It introduces two new one boson exchange models fitted to 2007 np data, achieving high accuracy and reproducing triton binding energy without three-nucleon forces.

Findings

Two models fit data with chi2/N close to 1.

Models accurately reproduce triton binding energy.

Updated phase shift analysis for all data until 2006.

Abstract

Using the covariant spectator theory (CST), we present two one boson exchange kernels that have been successfully adjusted to fit the 2007 world np data (containing 3788 data) below 350 MeV. One model (which we designate WJC-1) has 27 parameters and fits with a chi2/N = 1.06. The other model (designated WJC-2) has only 15 parameters and fits with a chi2/N = 1.12. Both of these models also reproduce the experimental triton binding energy without introducing additional irreducible three-nucleon forces. One result of this work is a new phase shift analysis, updated for all data until 2006, which is useful even if one does not work within the CST. In carrying out these fits we have reviewed the entire data base, adding new data not previously used in other high precision fits and restoring some data omitted in previous fits. A full discussion and evaluation of the 2007 data base is presented.