Spin observables in the two-nucleon capture and dissociation processes at low energies

TL;DR

This paper calculates spin observables in low-energy neutron capture and deuteron photodisintegration using pionless effective field theory, showing good agreement with traditional methods at very low energies but notable discrepancies at higher energies.

Contribution

It applies pionless effective field theory with di-baryon fields to spin observables in two-nucleon processes, highlighting energy-dependent differences from standard nuclear physics approaches.

Findings

Good agreement with standard approaches at very low energies

Discrepancies increase as energy rises

Discussion on the origin of differences

Abstract

Spin observables in radiative neutron capture on a proton and its inverse process, photodisintegration of the deuteron are calculated using a pionless effective field theory with di-baryon fields. Good agreement with the results of existing standard nuclear physics approach is obtained at very low energies. As energy increases, however, the discrepancy between the effective field theory and the standard nuclear physics approach becomes substantial. We discuss the origin of the difference.