Reactor antineutrino anomaly

被引：1065

作者：

Mention, G. ^{[1
]}

Fechner, M. ^{[1
]}

Lasserre, Th. ^{[1
,2
]}

Mueller, Th. A. ^{[3
]}

Lhuillier, D. ^{[3
]}

Cribier, M. ^{[1
,2
]}

Letourneau, A. ^{[3
]}

机构：

[1] CEA, Irfu, SPP, Ctr Saclay, F-91191 Gif Sur Yvette, France

[2] Astroparticule & Cosmol APC, F-75205 Paris 13, France

[3] CEA, Irfu, SPhN, Ctr Saclay, F-91191 Gif Sur Yvette, France

来源：

PHYSICAL REVIEW D | 2011年 / 83卷 / 07期

关键词：

NEUTRON FISSION-PRODUCTS; BETA-DECAY; SEARCH; OSCILLATIONS; SPECTRA; PU-239; MASS;

D O I：

10.1103/PhysRevD.83.073006

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Recently, new reactor antineutrino spectra have been provided for U-235, Pu-239, Pu-241, and U-238, increasing the mean flux by about 3%. To a good approximation, this reevaluation applies to all reactor neutrino experiments. The synthesis of published experiments at reactor-detector distances <100 m leads to a ratio of observed event rate to predicted rate of 0.976 +/- 0.024. With our new flux evaluation, this ratio shifts to 0.943 +/- 0.023, leading to a deviation from unity at 98.6% C. L. which we call the reactor antineutrino anomaly. The compatibility of our results with the existence of a fourth nonstandard neutrino state driving neutrino oscillations at short distances is discussed. The combined analysis of reactor data, gallium solar neutrino calibration experiments, and MiniBooNE-nu data disfavors the no-oscillation hypothesis at 99.8% C. L. The oscillation parameters are such that vertical bar Delta m(new)(2)vertical bar > 1.5 eV(2) (95%) and sin(2) (2 theta(new)) = 0.14 +/- 0.08 (95%). Constraints on the theta(13) neutrino mixing angle are revised.

引用

页数：20

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