Speaker
Mr
Dongqing Huang
(Brown University)
Description
The LUX dark matter experiment has measured the nuclear recoil charge and light yields in LXe down to 0.7 keVnr and 1.1 keVnr, respectively, in situ using a D-D neutron calibration source. Improvements in the D-D calibration have been possible by incorporating pulsing technique with narrow pulses (20 us / 250 Hz). This technique allows the suppression of accidental backgrounds in D-D neutron data and also provides increased sensitivity for the lower energy NR calibrations. I will report the improved NR absolute Qy and Ly measurements using the pulsed D-D calibration technique performed in situ in the LUX detector. I also present an absolute calibration of electron recoil (ER) charge yield using $^{127}$Xe electron capture events at energies down to the N-shell 186 eVee. These in situ energy calibrations, using D-D neutron and $^{127}$Xe sources, represent the lowest energy NR and ER that have been explored in liquid Xe and are accompanied by a significant improvement in calibration uncertainty.
Primary author
Mr
Dongqing Huang
(Brown University)