Chiral effective field theory corrections to ab initio M1 and Gamow-Teller observables in light nuclei

Ab initio nuclear theory attempts to predict the properties of atomic nuclei, starting from nucleons and their interactions. Modern realistic interactions, along with consistent electroweak operators, are derived systematically from chiral effective field theory (χEFT). We use the χEFT-derived magnetic dipole (M1) and Gamow-Teller (GT) operators to calculate the properties of light nuclei (A ≤ 17) within the Low Energy Nuclear Physics International Collaboration (LENPIC) formalism. We solve the quantum many-body problem using the no-core configuration interaction (NCCI), or no-core shell model (NCSM), approach and find that the inclusion of

χEFT corrections to the M1 and GT operators generally brings the calculated results closer to agreement with experiment. However, we also demonstrate that the convergence of the solution to the many-body problem still poses substantial difficulties for completely understanding the properties of the χEFT expansion.