期刊
PHYSICAL REVIEW LETTERS
卷 118, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.121802
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资金
- National Research Foundation (NRF) [IBS-R016-D1, 2012M2B2A6029111]
- Ministry of Science & ICT (MSIT), Republic of Korea [IBS-R016-D1-2017-A00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Council of Science & Technology (NST), Republic of Korea [GP2017-0013] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2012M2B2A6030210, 2016H1A2A1907060, 2015R1A2A1A13001843, 2012M2B2A6030715, 2012M2B2A6030202] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
An experiment to search for light sterile neutrinos is conducted at a reactor with a thermal power of 2.8 GW located at the Hanbit nuclear power complex. The search is done with a detector consisting of a ton of Gd-loaded liquid scintillator in a tendon gallery approximately 24 m from the reactor core. The measured antineutrino event rate is 1976 per day with a signal to background ratio of about 22. The shape of the antineutrino energy spectrum obtained from the eight-month data-taking period is compared with a hypothesis of oscillations due to active-sterile antineutrino mixing. No strong evidence of 3 + 1 neutrino oscillation is found. An excess around the 5 MeV prompt energy range is observed as seen in existing longer-baseline experiments. The mixing parameter sin(2)2 theta(14) is limited up to less than 0.1 for Delta m(41)(2) ranging from 0.2 to 2.3 eV(2) with a 90% confidence level.
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