Proposed low-energy absolute calibration of nuclear recoils in a   dual-phase noble element TPC using D-D neutron scattering kinematics
  We propose a new technique for the calibration of nuclear recoils in large noble element dual-phase time projection chambers used to search for WIMP dark matter in the local galactic halo. This technique provides an $\textit{in situ}$ measurement of the low-energy nuclear recoil response of the target media using the measured scattering angle between multiple neutron interactions within the detector volume. The low-energy reach and reduced systematics of this calibration have particular significance for the low-mass WIMP sensitivity of several leading dark matter experiments. Multiple strategies for improving this calibration technique are discussed, including the creation of a new type of quasi-monoenergetic 272 keV neutron source. We report results from a time-of-flight based measurement of the neutron energy spectrum produced by an Adelphi Technology, Inc. DD108 neutron generator, confirming its suitability for the proposed nuclear recoil calibration. 
J. R. Verbus, C. A. Rhyne, D. C. Malling, M. Genecov, S. Ghosh, A. G.   Moskowitz, S. Chan, J. J. Chapman, L. de Viveiros, C...
physics.ins-det astro-ph.IM hep-ex