期刊
PHYSICAL REVIEW LETTERS
卷 120, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.120.022503
关键词
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资金
- U.S. Department of Energy 'Fission in Rprocesses Elements' (FIRE) Topical Collaboration in nuclear theory
- Office of Nuclear Physics, Office of Science of the U.S. Department of Energy [DE-AC02-98CH10886]
- National Natural Science Foundation of China [11505056, 11605054]
- China Scholarship Council [201508330016]
We investigate the recent Daya Bay results on the changes in the antineutrino flux and spectrum with the burnup of the reactor fuel. We find that the discrepancy between current model predictions and the Daya Bay results can be traced to the original measured U-235/Pu-239 ratio of the fission beta spectra that were used as a base for the expected antineutrino fluxes. An analysis of the antineutrino spectra that is based on a summation over all fission fragment beta decays, using nuclear database input, explains all of the features seen in the Daya Bay evolution data. However, this summation method still allows for an anomaly. We conclude that there is currently not enough information to use the antineutrino flux changes to rule out the possible existence of sterile neutrinos.
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