Design Studies Of A Pulsed Quasimonoenergetic 2-keV Neutron Source For Calibration Of Low Threshold Dark Matter Detectors
physics.ins-det
/ Authors
L. Chaplinsky, S. Fiorucci, C. W. Fink, M. Garcia-Sciveres, W. Guo, S. A. Hertel, J. K. Wuko, X. Li, J. Lin, R. Mahapatra
and 17 more authors
W. Matava, D. N. McKinsey, D. Z. Osterman, P. K. Patel, B. Penning, H. D. Pinckney, M. Platt, Y. Qi, M. Reed, G. R. C Rischbieter, R. K. Romani, P. Sorensen, V. Velan, G. Wang, Y. Wang, S. L. Watkins, M. R. Williams
/ Abstract
We describe design studies for a pulsed quasi-monoenergetic 2-keV neutron source for calibration of sub-keV nuclear recoils. Such a calibration is required for detectors sensitive to sub-GeV dark matter and also the coherent elastic scattering of reactor neutrinos. In our design, neutrons from a commercial deuterium-tritium generator are moderated to the keV scale and then filtered to the monoenergetic spectrum using a feature in the neutron cross section of scandium. In this approach, unmoderated high-energy neutrons form a challenging background, along with gammas from neutron capture in the moderator materials. We describe the optimization of the moderator+filter and shielding geometry, and find a geometry that in simulation achieves both the target neutron flux at 2 keV and subdominant rates of background interactions. Lastly, we describe a future path to lower-energy (few eV scale) calibrations using time-of-flight and sub-keV neutrons.