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Sizable hyperpolarisation, i.e. an imbalance of the occupation numbers ofnuclear spins in a sample deviating from thermal equilibrium, is needed invarious fields of science. For example, hyperpolarised tracers are utilised inmagnetic resonance imaging in medicine (MRI) and polarised beams and targetsare employed in nuclear physics to study the spin dependence of nuclear forces.Here we show that the quantum interference of transitions induced by radio-wavepumping with longitudinal and radial pulses are able to produce largepolarisations at small magnetic fields. This method is easier than establishedmethods, theoretically understood and experimentally proven for beams ofmetastable hydrogen atoms in the keV energy range. It should also work for avariety of samples at rest. Thus, this technique opens the door for a newgeneration of polarised tracers, possibly low-field MRI with better spatialresolution or the production of polarised fuel to increase the efficiency offusion reactors by manipulating the involved cross sections.

A Universal Method to Generate Hyperpolarisation in Beams and Samples