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We present Quantum Monte Carlo calculations of magnetic moments and M1transitions in $A\le 9$ nuclei which take into account contributions oftwo-body electromagnetic currents. The Hamiltonian utilized to generate thenuclear wave functions includes the realistic Argonne-{\it v}$_{18}$two-nucleon and the Illinois-7 three-nucleon interactions. The nuclear two-bodyelectromagnetic currents are derived from a pionful chiral effective fieldtheory including up to one-loop corrections. These currents involve unknown LowEnergy Constants which have been fixed so as to reproduce a number ofexperimental data for the two- and three-nucleon systems, such as $np$ phaseshifts and deuteron, triton, and $^3$He magnetic moments. This preliminarystudy shows that two-body contributions provide significant corrections whichare crucial to bring the theory in agreement with the experimental data in bothmagnetic moments and M1 transitions.

Quantum Monte Carlo calculations of magnetic moments and M1 transitions in $A \le 9$ nuclei