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This content will become publicly available on July 11, 2019

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

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 γ ray for X to be dark matter. A Compton-suppressed high-purity germanium detector is used to identify γ 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 γ rays arising from the dark matter decay mode. Lastly, we exclude the possibility of a sufficiently strong branch to explain the lifetime discrepancy with 97% confidence.
Authors:
 [1] ;  [2] ; ORCiD logo [3] ;  [4] ;  [1] ;  [5] ;  [1] ;  [1] ;  [2] ;  [6] ;  [7] ;  [2] ;  [1] ;  [7] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [8] more »;  [9] ;  [1] ;  [1] ;  [5] ;  [5] « less
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. California Inst. of Technology (CalTech), Pasadena, CA (United States). Kellogg Radiation Lab.
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. North Carolina State Univ., Raleigh, NC (United States)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); North Carolina State Univ., Raleigh, NC (United States)
  6. Inst. Laue-Langevin (ILL), Grenoble (France)
  7. Indiana Univ., Bloomington, IN (United States). Dept. of Physics
  8. Univ. of Kentucky, Lexington, KY (United States)
  9. Univ. of Washington, Seattle, WA (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725; 20140568DR; FG02-97ER41042; SC0014622; 8215
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 121; Journal Issue: 2; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
OSTI Identifier:
1462879
Alternate Identifier(s):
OSTI ID: 1459740