May 24 – 28, 2021
America/Vancouver timezone

Low-energy Monoenergetic Neutron Production with a DD-Neutron Source for sub-keV Nuclear Recoil Calibrations in the LUX and LZ Experiments

May 25, 2021, 8:24 AM
18m
Parallel session talk Experiments: Dark Matter Detectors Experiments: Dark Matter Detectors

Speaker

Mr Will Taylor (Brown University / LUX / LZ)

Description

Nuclear recoil (NR) calibrations are vital for understanding detector responses to dark matter candidates and neutrino-nucleus signals in direct detection experiments. Low-mass (<5 GeV) dark matter candidates and $^8$B neutrinos drive the need for high-statistics/low-systematic calibrations at sub-keV NR energies.
We report the results of NR calibrations in the LUX dark matter detector using 2.45 MeV neutrons from an Adelphi Technologies, Inc. DD neutron generator and describe the R&D done to increase the instantaneous intensity to $10^{10}$ n/s and reduce pulse width to 12 $\mu$s FWHM. Complete kinematic reconstruction has allowed the charge and light yields to be determined down to 0.27 keVnr and 0.45 keVnr, respectively.
We also describe techniques to reduce the incident neutron energy via controlled backscattering off deuterium- and hydrogen-based targets, achieving neutron energies of 350 keV and 10-100 keV, respectively, needed to probe even lower mass dark matter candidates.

Primary author

Mr Will Taylor (Brown University / LUX / LZ)

Presentation materials