中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Evolution of the reactor antineutrino flux and spectrum at daya bay

文献类型:期刊论文

作者An, F. P.1; Balantekin, A. B.2; Band, H. R.3,4; Bishai, M.5; Blyth, S.6,7; Cao, D.8; Cao, G. F.9; Cao, J.9; Chan, Y. L.10; Chang, J. F.9
刊名Physical review letters
出版日期2017-06-19
卷号118期号:25页码:8
ISSN号0031-9007
DOI10.1103/physrevlett.118.251801
通讯作者An, f. p.()
英文摘要The daya bay experiment has observed correlations between reactor core fuel evolution and changes in the reactor antineutrino flux and energy spectrum. four antineutrino detectors in two experimental halls were used to identify 2.2 million inverse beta decays (ibds) over 1230 days spanning multiple fuel cycles for each of six 2.9 gw(th) reactor cores at the daya bay and ling ao nuclear power plants. using detector data spanning effective pu-239 fission fractions f-239 from 0.25 to 0.35, daya bay measures an average ibd yield (sigma) over bar (f) of (5.90 +/- 0.13) x 10(-43) cm(2)/fission and a fuel-dependent variation in the ibd yield, d sigma(f)/df(239), of (-1.86 +/- 0.18) x 10(-43) cm(2)/fission. this observation rejects the hypothesis of a constant antineutrino flux as a function of the pu-239 fission fraction at 10 standard deviations. the variation in ibd yield is found to be energy dependent, rejecting the hypothesis of a constant antineutrino energy spectrum at 5.1 standard deviations. while measurements of the evolution in the ibd spectrum show general agreement with predictions from recent reactor models, the measured evolution in total ibd yield disagrees with recent predictions at 3.1 sigma. this discrepancy indicates that an overall deficit in the measured flux with respect to predictions does not result from equal fractional deficits from the primary fission isotopes u-235, pu-239, u-238, and pu-241. based on measured ibd yield variations, yields of (6.17 +/- 0.17) and (4.27 +/- 0.26) x 10(-43) cm(2)/fission have been determined for the two dominant fission parent isotopes u-235 and pu-239. a 7.8% discrepancy between the observed and predicted u-235 yields suggests that this isotope may be the primary contributor to the reactor antineutrino anomaly.
WOS关键词NEUTRON FISSION-PRODUCTS
WOS研究方向Physics
WOS类目Physics, Multidisciplinary
语种英语
出版者AMER PHYSICAL SOC
WOS记录号WOS:000403560000001
URI标识http://www.irgrid.ac.cn/handle/1471x/2177383
专题高能物理研究所
通讯作者An, F. P.
作者单位1.East China Univ Sci & Technol, Inst Modern Phys, Shanghai, Peoples R China
2.Univ Wisconsin, Madison, WI 53706 USA
3.Yale Univ, Wright Lab, New Haven, CT 06520 USA
4.Yale Univ, Dept Phys, New Haven, CT 06520 USA
5.Brookhaven Natl Lab, Upton, NY 11973 USA
6.Natl Taiwan Univ, Dept Phys, Taipei, Taiwan
7.Natl United Univ, Miaoli, Taiwan
8.Nanjing Univ, Nanjing, Peoples R China
9.Inst High Energy Phys, Beijing, Peoples R China
10.Chinese Univ Hong Kong, Hong Kong, Hong Kong, Peoples R China
推荐引用方式
GB/T 7714
An, F. P.,Balantekin, A. B.,Band, H. R.,et al. Evolution of the reactor antineutrino flux and spectrum at daya bay[J]. Physical review letters,2017,118(25):8.
APA An, F. P..,Balantekin, A. B..,Band, H. R..,Bishai, M..,Blyth, S..,...&Zou, J. H..(2017).Evolution of the reactor antineutrino flux and spectrum at daya bay.Physical review letters,118(25),8.
MLA An, F. P.,et al."Evolution of the reactor antineutrino flux and spectrum at daya bay".Physical review letters 118.25(2017):8.

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