Quantum Monte Carlo calculations of electromagnetic moments and transitions in A≤ 10 nuclei with two-body cEFT currents

We present ab initio Quantum Monte Carlo calculations of electromagnetic observables of light nuclei based on a many-body nuclear Hamiltonian consisting of the Argonne-v18 and Illioins-7 two-And three-nucleon potentials, respectively. External electromagnetic probes interact with the electromagnetic charge and current distributions of nuclei. Nuclear charge and current operators account for one-And two-body contributions describing, respectively, the coupling of photons with individual nucleons, as well as pairs of interacting nucleons. Two-body operators are derived from a chiral effective field theory with pions and nucleons including up to two-pion exchange corrections. It is found that two-body contributions can be large and crucial to reach agreement with the experimental data, particularly for selected nuclear magnetic moments and M1 transitions.