We have demonstrated in a pilot study using an existing experiment that superfluid 3He at 100 μK can be used as a nuclear recoil detector sensitive to neutron and γ-ray interactions depositing energies down to a few hundred eV. The deposited energy is converted to 3He quasiparticles which are detected by their effect on a vibrating wire resonator in the liquid. The system can be calibrated independently using a second vibrating wire as a heater but a convenient fixed point is provided by the exothermic reaction n + 32H = p + 31H + 764 keV. Given the great potential for improvement we propose that the system might make a sensitive WIMP detector.
Bradley David I.
Follows M. R.
Hayes W. M.
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