Electromagnetic Processes in χEFT
Abstract
Nuclear electromagnetic currents derived in a chiral-effective-field-theory framework including explicit nucleons, Δ isobars, and pions up to N2LO, 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 Δ-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 /rightarrow n - d processes, are significantly underpredicted by theory.
- Publication:
-
Modern Physics Letters A
- Pub Date:
- 2009
- DOI:
- 10.1142/S0217732309000310
- arXiv:
- arXiv:0809.2555
- Bibcode:
- 2009MPLA...24..931P
- Keywords:
-
- 12.39.Fe;
- 13.40.-f;
- 25.10.+s;
- 25.40.Lw;
- Chiral Lagrangians;
- Electromagnetic processes and properties;
- Nuclear reactions involving few-nucleon systems;
- Radiative capture;
- Nuclear Theory
- E-Print:
- Invited talk to the "Fourth Asia-Pacific Conference on Few-Body Problems in Physics", to appear in Modern Physics Letters A