Sterile Neutrino Search at the NEOS Experiment
- Authors
- Ko, Y. J.; Kim, B. R.; Kim, J. Y.; Han, B. Y.; Jang, C. H.; Jeon, E. J.; Joo, K. K.; Kim, H. J.; Kim, H. S.; Kim, Y. D.; Lee, Jaison; Lee, J. Y.; Lee, M. H.; Oh, Y. M.; Park, H. K.; Park, H. S.; Park, K. S.; Seo, K. M.; Siyeon, Kim; Sun, G. M.
- Issue Date
- Mar-2017
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW LETTERS, v.118, no.12
- Journal Title
- PHYSICAL REVIEW LETTERS
- Volume
- 118
- Number
- 12
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/4680
- DOI
- 10.1103/PhysRevLett.118.121802
- ISSN
- 0031-9007
1079-7114
- Abstract
- 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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