High-Density Ultracold Neutron Source for Low-Energy Particle Physics Experiments
Abstract
SuperSUN, a new superthermal source of ultracold neutrons (UCN) at the Institut Laue-Langevin, exploits inelastic scattering of neutrons in isotopically pure superfluid 4He at temperatures below 0.6\,K. For the first time, continuous operation with an intense broad-spectrum cold neutron beam is demonstrated over 60 days. We observe continuous UCN extraction rates of 21000\,s-1, and storage in the source with saturated in-situ density 273\,cm-3. The high stored density, low-energy UCN spectrum, and long storage times open new possibilities in fundamental and applied physics.
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