Search for Sub-eV Sterile Neutrinos at RENO

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We report a search result for a light sterile neutrino oscillation with roughly 2200 live days of data in the RENO experiment. The search is performed by electron antineutrino ((nu) over bar (e)) disappearance taking place between six 2.8GW(th) reactors and two identical detectors located at 294 m (near) and 1383 m (far) from the center of the reactor array. A spectral comparison between near and far detectors can explore reactor (nu) over bar (e) oscillations to a light sterile neutrino. An observed spectral difference is found to be consistent with that of the three-flavor oscillation model. This yields limits on sin(2) 2 theta(14) in the 10(-4) less than or similar to vertical bar Delta m(41)(2)vertical bar less than or similar to 0.5 eV(2) region, free from reactor (nu) over bar (e) flux and spectrum uncertainties. The RENO result provides the most stringent limits on sterile neutrino mixing at vertical bar Delta m(41)(2)vertical bar less than or similar to 0.002 eV(2) using the (nu) over bar (e) disappearance channel.
Publisher
AMER PHYSICAL SOC
Issue Date
2020-11
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW LETTERS, v.125, no.19

ISSN
0031-9007
DOI
10.1103/PhysRevLett.125.191801
URI
http://hdl.handle.net/10203/277457
Appears in Collection
PH-Journal Papers(저널논문)
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