Search for the Neutron Decay , Where is a Dark Matter Particle
Open Access
- 11 July 2018
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 121 (2), 022505
- https://doi.org/10.1103/physrevlett.121.022505
Abstract
Fornal and Grinstein recently proposed that the discrepancy between two different methods of neutron lifetime measurements, the beam and bottle methods, can be explained by a previously unobserved dark matter decay mode, . We perform a search for this decay mode over the allowed range of energies of the monoenergetic ray for to be dark matter. A Compton-suppressed high-purity germanium detector is used to identify rays from neutron decay in a nickel-phosphorous-coated stainless-steel bottle. A combination of Monte Carlo and radioactive source calibrations is used to determine the absolute efficiency for detecting rays arising from the dark matter decay mode. We exclude the possibility of a sufficiently strong branch to explain the lifetime discrepancy with 97% confidence.
Keywords
Funding Information
- Laboratory Directed Research and Development (20140568DR)
- National Science Foundation (130692, 1307426, 161454, 1506459, 1553861)
- U.S. Department of Energy (DE-FG02-97ER41042, DE-SC0014622, DE-AC05-00OR22725)
- LLC (8215)
- IU Center for Space Time Symmetries (IUCSS)
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