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We present the results of lattice QCD calculations of the magnetic moments ofthe lightest nuclei, the deuteron, the triton and ${}^3$He, along with those ofthe neutron and proton. These calculations, performed at quark massescorresponding to $m_\pi \sim 800$ MeV, reveal that the structure of thesenuclei at unphysically heavy quark masses closely resembles that at thephysical quark masses. In particular, we find that the magnetic moment of${}^3$He differs only slightly from that of a free neutron, as is the case innature, indicating that the shell-model configuration of two spin-pairedprotons and a valence neutron captures its dominant structure. Similarly ashell-model-like moment is found for the triton, $\mu_{{}^3{\rm H}} \sim\mu_p$. The deuteron magnetic moment is found to be equal to the nucleonisoscalar moment within the uncertainties of the calculations.

Magnetic moments of light nuclei from lattice quantum chromodynamics