Electromagnetic Processes in $\chi$EFT

Abstract

Nuclear electromagnetic currents derived in a chiral-effective-field-theory framework including explicit nucleons, $\Delta$ isobars, and pions up to N${}^2$LO, {\it i.e.} ignoring loop corrections, are used in a study of neutron radiative captures on protons and deuterons at thermal energies, and of $A$=2 and 3 nuclei magnetic moments. With the strengths of the $\Delta$-excitation currents determined to reproduce the $n$-$p$ cross section and isovector combination of the trinucleon magnetic moments, we find that the cross section and photon circular polarization parameter, measured respectively in $n$-$d$ and $\vec{n}$-$d$ processes, are significantly underpredicted by theory.

Invited talk to the "Fourth Asia-Pacific Conference on Few-Body Problems in Physics", to appear in Modern Physics Letters A

References in corpus (2)

• A high-precision variational approach to three- and four-nucleon bound and zero-energy scattering states
• Effective field theory approach for the M1 properties of A=2 and 3 nuclei

Cited by in corpus (1)

• Up-to N${}^3$LO heavy-baryon chiral perturbation theory calculation for the M1 properties of three-nucleon systems