$ np \leftrightarrow d\gamma $ reactions calculated up to $E_{\gamma}=20$ MeV

TL;DR

This paper calculates electromagnetic dipole transition cross sections for np and dγ reactions up to 20 MeV using chiral EFT interactions and operators, introducing a new Efros-based method adaptable for many-body systems.

Contribution

It presents a novel application of the Efros method combined with chiral EFT to compute reaction cross sections over a broad energy range.

Findings

Results agree with existing experimental data.

Provides predictions at energies lacking experimental data.

Introduces a new adaptable approach for future many-body calculations.

Abstract

We calculate the electromagnetic dipole transition cross sections for the $np \rightarrow d\gamma$ and $ d\gamma \rightarrow np$ reactions over a broad range of energies. We use the LENPIC nucleon-nucleon interaction obtained from chiral effective field theory ($\chi$EFT) up to next-to-next-to-next-to-next-to-leading order (N4LO) and effective electromagnetic dipole transition operators obtained from the same $\chi$EFT up to N2LO. Our results agree with existing experiments. We get results at energies for which experimental data and/or modern theoretical calculations have not been reported. In this study, we utilize a new approach, namely, our adaptation of the Efros [V. D. Efros, Phys. Rev. C 99, 034620 (2019)] method that is prospective for future many-body applications in calculations of bound and continuum state wave functions.