An MRI term referring to an intrinsic property of nuclei with an odd numbers of protons and/or neutrons to exhibit angular momentum and a magnetic moment; even-numbered nuclei do not produce NMR signals.
As can be seen from the above citation, he was so inspired as to postulate non-zero angular momentum of the atomic nucleus (nuclear spin) with which the atomic electrons possess a magnetic dipole interaction, giving additional effects to the atomic spectra.
Using this characteristics, the joint research group has produced and detected entanglement between two quantum bits by treating the nuclear spin of a phosphorus atom as one quantum bit and the captured electron's spin as another quantum bit.
MRI creates images using the principles of Nuclear Magnetic Resonance, and it is possible in the scallop, because its soft-tissued body is filled with small biological "magnets," the most abundant and responsive of which is the proton, the nucleus of the hydrogen atom, and it possesses a nonzero angular momentum or nuclear spin, which creates a magnetic dipole moment along their rotational axis.
Such intermolecular hyperfine couplings can be used for elemental analysis in the vicinity of the probe molecule, as they are fairly short-range: the dipolar coupling decays with the inverse cube of the distance between electron and nuclear spin and the transfer of spin density decays roughly exponentially with distance.
An atom's spin, like its charge, is an intrinsic property of atomic nuclei, and the PICO bubble chamber exploits that fact by using a fluid component - fluoride - with a relatively large nuclear spin. That increased its ability to detect spin-sensitive WIMPs by a factor of 17.
To measure the effectiveness of their shielding, they employed a variety of different sensors, including a fluxgate probe, liquid-helium cooled SQUID (superconducting quantum interference device) magnetometers, mercury nuclear spin magnetometers, and cesium atomic vapor magnetometers.