We present limits on spin-independent dark matter-nucleon interactions using a 10.6 g Si athermal phonon detector with a baseline energy resolution of σE=3.86±0.04(stat)-0.00+0.19(syst) eV. This exclusion analysis sets the most stringent dark matter-nucleon scattering cross-section limits achieved by a cryogenic detector for dark matter particle masses from 93 to 140 MeV/c2, with a raw exposure of 9.9 g d acquired at an above-ground facility. This work illustrates the scientific potential of detectors with athermal phonon sensors with eV-scale energy resolution for future dark matter searches.
Bibliographical noteFunding Information:
Funding and support were received from the National Science Foundation, the U.S. Department of Energy (DOE), Fermilab URA Visiting Scholar Grant No. 15-S-33, NSERC Canada, the Canada First Excellence Research Fund, the Arthur B. McDonald Institute (Canada), Michael M. Garland, the Department of Atomic Energy Government of India (DAE), and the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)—Project No. 420484612 and under Germany’s Excellence Strategy–EXC 2121 “Quantum Universe”—390833306. Fermilab, PNNL, SLAC, and LBNL are operated under Contracts No. DE-AC02-07CH11359, No. DE-AC05-76RL01830, No. DE-AC02-76SF00515, and No. DE-AC02-05CH11231, respectively, with the U.S. Department of Energy.
© 2021 authors. Published by the American Physical Society.