期刊
PHYSICAL REVIEW LETTERS
卷 116, 期 24, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.116.242501
关键词
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资金
- Advanced Research Computing at the University of Michigan, Ann Arbor
- National Institute of Standards and Technology, U.S. Department of Commerce
- National Science Foundation [PHY-0969654, PHY-1205266, PHY-1205393, PHY-1306547, PHY-1505196]
- U.S. Department of Energy [DE-FG02-96ER40989]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1506021] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1306547, 1505196] Funding Source: National Science Foundation
The standard model predicts that, in addition to a proton, an electron, and an antineutrino, a continuous spectrum of photons is emitted in the beta decay of the free neutron. We report on the RDK II experiment which measured the photon spectrum using two different detector arrays. An annular array of bismuth germanium oxide scintillators detected photons from 14 to 782 keV. The spectral shape was consistent with theory, and we determined a branching ratio of 0.00335 +/- 0.00005 [stat] +/- 0.00015 [stat]. A second detector array of large area avalanche photodiodes directly detected photons from 0.4 to 14 keV. For this array, the spectral shape was consistent with theory, and the branching ratio was determined to be 0.00582 +/- 0.00023 [stat] +/- 0.00062 [stat]. We report the first precision test of the shape of the photon energy spectrum from neutron radiative decay and a substantially improved determination of the branching ratio over a broad range of photon energies.
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