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Search for the Neutron Decay n → X + γ, Where X is a Dark Matter Particle

Tang, Z. and Blatnik, M. and Broussard, L. J. and Choi, J. H. and Clayton, S. M. and Cude-Woods, C. and Currie, S. and Fellers, D. E. and Fries, E. M. and Geltenbort, P. and Gonzalez, F. and Hickerson, K. P. and Ito, T. M. and Liu, C.-Y. and MacDonald, S. W. T. and Makela, M. and Morris, C. L. and O'Shaughnessy, C. M. and Pattie, R. W., Jr. and Plaster, B. and Salvat, D. J. and Saunders, A. and Wang, Z. and Young, A. R. and Zeck, B. A. (2018) Search for the Neutron Decay n → X + γ, Where X is a Dark Matter Particle. Physical Review Letters, 121 (2). Art. No. 022505. ISSN 0031-9007.

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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, n → X + γ. We perform a search for this decay mode over the allowed range of energies of the monoenergetic γray for X to be dark matter. A Compton-suppressed high-purity germanium detector is used to identify γrays 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 γ 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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Hickerson, K. P.0000-0001-7647-119X
Ito, T. M.0000-0003-3494-6796
Morris, C. L.0000-0003-2141-0255
Additional Information:© 2018 American Physical Society. (Received 5 February 2018; revised manuscript received 1 May 2018; published 11 July 2018) This work was supported by the Los Alamos Laboratory Directed Research and Development (LDRD) office (Grant No. 20140568DR), the LDRD Program of Oak Ridge National Laboratory, managed by UT-Battelle, Limited Liability Corporation (LLC) (Grant No. 8215), the National Science Foundation (Grants No. 130692, No. 1307426, No. 161454, No. 1506459, and No. 1553861), the Indiana University (IU) Center for Space Time Symmetries (IUCSS), and United States Department of Energy (U.S. DOE) Low Energy Nuclear Physics (Grants No. DE-FG02-97ER41042, No. DE-SC0014622, and No. DE-AC05-00OR22725). The authors would like to thank the staff of Los Alamos Neutron Science Center (LANSCE) for their diligent efforts to develop the diagnostics and new techniques required to provide the proton beam for this experiment.
Funding AgencyGrant Number
Los Alamos National Laboratory20140568DR
Oak Ridge National Laboratory8215
Indiana UniversityUNSPECIFIED
Department of Energy (DOE)DE-FG02-97ER41042
Department of Energy (DOE)DE-SC0014622
Department of Energy (DOE)DE-AC05-00OR22725
Issue or Number:2
Record Number:CaltechAUTHORS:20180712-132225554
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87807
Deposited By: George Porter
Deposited On:13 Jul 2018 16:47
Last Modified:09 Mar 2020 13:18

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