Improved sterile neutrino constraints from the STEREO experiment with 179 days of reactor-on data

被引：76

作者：

Almazan, H. ^{[1
]}

Bernard, L. ^{[2
,6
]}

Blanchet, A. ^{[3
,7
]}

Bonhomme, A. ^{[1
,3
]}

Buck, C. ^{[1
]}

Sanchez, P. del Amo ^{[4
]}

El Atmani, I ^{[3
,8
]}

Haser, J. ^{[1
]}

Kandzia, F. ^{[5
]}

Kox, S. ^{[2
]}

Labit, L. ^{[4
]}

Lamblin, J. ^{[2
]}

Letourneau, A. ^{[3
]}

Lhuillier, D. ^{[3
]}

Licciardi, M. ^{[2
]}

Lindner, M. ^{[1
]}

Materna, T. ^{[3
]}

Minotti, A. ^{[3
,4
]}

Pessard, H. ^{[4
]}

Real, J-S ^{[2
]}

Roca, C. ^{[1
]}

Rogly, R. ^{[3
]}

Salagnac, T. ^{[2
,9
]}

Savu, V ^{[3
]}

Schoppmann, S. ^{[1
]}

Sergeyeva, V ^{[4
,10
]}

Soldner, T. ^{[5
]}

Stutz, A. ^{[2
]}

Vialat, M. ^{[5
]}

机构：

[1] Max Planck Inst Kernphys, Saupfercheckweg 1, D-69117 Heidelberg, Germany

[2] Univ Grenoble Alpes, CNRS, Grenoble INP, LPSC IN2P3, F-38000 Grenoble, France

[3] Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France

[4] Univ Grenoble Alpes, Univ Savoie Mt Blanc, CNRS, IN2P3,LAPP, F-74000 Annecy, France

[5] Inst Laue Langevin, CS 20156, F-38042 Grenoble 9, France

[6] Ecole Polytech, CNRS, IN2P3, Lab Leprince Ringuet, F-91128 Palaiseau, France

[7] Univ Paris, Sorbonne Univ, LPNHE, CNRS,IN2P3, F-75005 Paris, France

[8] Hassan II Univ, Fac Sci, BP 5366 Maarif, Casablanca 20100, Morocco

[9] Univ Lyon 1, Univ Lyon, IN2P3, CNRS,Inst Phys Nucl Lyon, F-69622 Villeurbanne, France

[10] CNRS, IN2P3, Inst Phys Nucl Orsay, 15 Rue Georges Clemenceau, F-91406 Orsay, France

来源：

PHYSICAL REVIEW D | 2020年 / 102卷 / 05期

关键词：

FISSION-PRODUCTS; SEARCH; OSCILLATIONS; RATIO;

D O I：

10.1103/PhysRevD.102.052002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The STEREO experiment is a very short baseline reactor antineutrino experiment. It is designed to test the hypothesis of light sterile neutrinos being the cause of a deficit of the observed antineutrino interaction rate at short baselines with respect to the predicted rate, known as the reactor antineutrino anomaly. The STEREO experiment measures the antineutrino energy spectrum in six identical detector cells covering baselines between 9 and 11 m from the compact core of the ILL research reactor. In this article, results from 179 days of reactor turned on and 235 days of reactor turned off are reported at a high degree of detail. The current results include improvements in the modelling of detector optical properties and the gamma-cascade after neutron captures by gadolinium, the treatment of backgrounds, and the statistical method of the oscillation analysis. Using a direct comparison between antineutrino spectra of all cells, largely independent of any flux prediction, we find the data compatible with the null oscillation hypothesis. The best-fit point of the reactor antineutrino anomaly is rejected at more than 99.9% C.L.

引用

页数：31