Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session J09: Sub-GeV Dark Matter
1:30 PM–3:18 PM,
Sunday, April 14, 2019
Sheraton
Room: Governor's Square 11
Sponsoring
Unit:
DPF
Chair: Bertrand Echenard, Caltech
Abstract: J09.00009 : Low Energy Nuclear Recoil Calibration with Neutron Capture*
3:06 PM–3:18 PM
View Presentation Abstract
Presenter:
Nicholas Mast
(University of Minnesota)
Authors:
Nicholas Mast
(University of Minnesota)
Matthew Fritts
(University of Minnesota)
Anthony Nicholas Villano
(University of Colorado, Denver)
the identification of nuclear recoils using germanium and silicon as detector materials. At the
sub-keV recoil energy scales being probed by the latest generation of such experiments, the
ionization yield of nuclear recoils in germanium and silicon is an important, but poorly
characterized, material property. A technique has been proposed to measure this yield using the
spectrum of nuclear recoils resulting from nuclear de-excitation following thermal neutron
capture in the detector crystal. This talk will present a method to measure this thermal
neutron-capture signal in germanium and silicon detectors developed for the Super Cryogenic
Dark Matter Search at SNOLAB. The measurement technique and detector principle will be
discussed as will some challenges faced in performing measurements at such low energies.
Preliminary evidence of the desired signal in a silicon detector will also be presented.
*This work was supported by DOE grant DE-SC0012294 and NSF grant 1743790.
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