Applications of an Y-88/Be photo-neutron calibration source to Dark Matter and Neutrino Experiments

Understand

The low-energy monochromatic neutron emission from an Y-88/Be source can be exploited to mimic the few keVnr nuclear recoils expected from low-mass Weakly Interacting Massive Particles (WIMPs) and coherent scattering of neutrinos off nuclei.

• Using this source, a ~<10% quenching factor is measured for sodium recoils below 24 keVnr in NaI[Tl].
• This is considerably smaller than the 30% typically adopted in the interpretation of the DAMA/LIBRA dark matter experiment, resulting in a marked increase of its tension with other searches, under the standard set of phenomenological assumptions.
• The method is illustrated for other target materials (superheated and noble liquids).