(A) Neutrino fluxes and event ratios

Events (observed/expected) from reactor ${{\overline{\boldsymbol \nu}}_{{e}}}$ experiments. INSPIRE search

The quoted values are the ratios of the measured reactor ${{\overline{\mathit \nu}}_{{e}}}$ event rate at the quoted distances, and the rate expected without oscillations. The expected rate is based on the experimental data for the most significant reactor fuels (${}^{235}\mathrm {U}$, ${}^{239}\mathrm {Pu}$, ${}^{241}\mathrm {Pu}$) and on calculations for ${}^{238}\mathrm {U}$.

A recent re-evaluation of the spectral conversion of electron to ${{\overline{\mathit \nu}}_{{e}}}$ in MUELLER 2011 results in an upward shift of the reactor ${{\overline{\mathit \nu}}_{{e}}}$ spectrum by 3$\%$ and, thus, might require revisions to the ratios listed in this table.

VALUE DOCUMENT ID TECN  COMMENT
• • • We do not use the following data for averages, fits, limits, etc. • • •
$0.949$ $\pm0.0028$ 1
AN
2017A
DAYA DayaBay, Ling Ao/Ao II reactors
2
AN
2016
DAYA DayaBay, Ling Ao/Ao II reactors
$0.944$ $\pm0.007$ $\pm0.003$ 3
AN
2013
DAYA DayaBay, Ling Ao/Ao II reactors
$0.944$ $\pm0.016$ $\pm0.040$ 4
ABE
2012
DCHZ Chooz reactors
$0.920$ $\pm0.009$ $\pm0.014$ 5
AHN
2012
RENO Yonggwang reactors
$0.940$ $\pm0.011$ $\pm0.004$ 6
AN
2012
DAYA DayaBay, LIng Ao/Ao II reactors
$1.08$ $\pm0.21$ $\pm0.16$ 7
DENIZ
2010
TEXO Kuo-Sheng reactor, 28 m
$0.658$ $\pm0.044$ $\pm0.047$ 8
ARAKI
2005
KLND Japanese react. $\sim{}$180 km
$0.611$ $\pm0.085$ $\pm0.041$ 9
EGUCHI
2003
KLND Japanese react. $\sim{}$180 km
$1.01$ $\pm0.024$ $\pm0.053$ 10
BOEHM
2001
Palo Verde react. $0.75 - 0.89$ km
$1.01$ $\pm0.028$ $\pm0.027$ 11
APOLLONIO
1999
CHOZ Chooz reactors 1$~$km
$0.987$ $\pm0.006$ $\pm0.037$ 12
GREENWOOD
1996
Savannah River, $18.2~$m
$0.988$ $\pm0.004$ $\pm0.05$
ACHKAR
1995
CNTR Bugey reactor, 15$~$m
$0.994$ $\pm0.010$ $\pm0.05$
ACHKAR
1995
CNTR Bugey reactor, 40$~$m
$0.915$ $\pm0.132$ $\pm0.05$
ACHKAR
1995
CNTR Bugey reactor, 95$~$m
$0.987$ $\pm0.014$ $\pm0.027$ 13
DECLAIS
1994
CNTR Bugey reactor, 15$~$m
$0.985$ $\pm0.018$ $\pm0.034$
KUVSHINNIKOV
1991
CNTR Rovno reactor
$1.05$ $\pm0.02$ $\pm0.05$
VUILLEUMIER
1982
Gosgen reactor
$0.955$ $\pm0.035$ $\pm0.110$ 14
KWON
1981
${{\overline{\mathit \nu}}_{{e}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit n}}$
$0.89$ $\pm0.15$ 14
BOEHM
1980
${{\overline{\mathit \nu}}_{{e}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit n}}$
1  AN 2017A use 1230 days of data of the Daya Bay experiment. The reported deficit is based on the ratio of the ${{\overline{\mathit \nu}}_{{e}}}$ signal observed by the far detectors versus the near detectors and correcting for differences in detector exposure. Supersedes AN 2013 .
2  AN 2016 use 217 days of data (338k events) to determine the neutrino flux ratio relative to the prediction of Mueller-Huber and ILL-Vogel models (see AN 2016 for details). The reported flux ratios were corrected for ${{\mathit \theta}_{{13}}}$ oscillation effect. The flux measurement is consistent with results from previous short-baseline reactor experiments. The measured inverse beta decay yield is ($1.55$ $\pm0.04$) $ \times 10^{-18}$ cm${}^{2}$/(GW day) or $\sigma _{f}$ = ($5.92$ $\pm0.14$) $ \times 10^{-43}$ cm${}^{2}$/fission. About 4$\sigma $ excess of events was observed in the $4 - 6$ MeV prompt energy region.
3  AN 2013 use six identical detectors, with three placed near the reactor cores (flux-weighted baselines of 470 and 576 m) and the remaining three at the far hall (at the flux averaged distance of 1648 m from all six reactor cores) to determine the mixing angle ${{\mathit \theta}_{{13}}}$ using the ${{\overline{\mathit \nu}}_{{e}}}$ observed interaction rate ratios. This rate-only analysis excludes the no-oscillation hypothesis at 7.7 standard deviations. The value of $\Delta $m${}^{2}_{31}$ = $2.32 \times 10^{-3}$ eV${}^{2}$ was assumed in the analysis. This is an improved result (2.5 times increase in statistics) compared to AN 2012 . Superseded by AN 2017A.
4  ABE 2012 determine the ${{\overline{\mathit \nu}}_{{e}}}$ interaction rate in a single detector, located 1050 m from the cores of two reactors. The rate normalization is fixed by the results of the Bugey4 reactor experiment, thus avoiding any dependence on possible very short baseline oscillations.
5  AHN 2012 use two identical detectors, placed at flux weighted distances of 408.56 m and 1433.99m from six reactor cores, to determine the ${{\overline{\mathit \nu}}_{{e}}}$ interaction rate ratio.
6  AN 2012 use six identical detectors with three placed near the reactor cores (flux-weighted baselines of 470 m and 576 m) and the remaining three at the far hall (at the flux averaged distance of 1648 m from all six reactor cores) to determine the ${{\overline{\mathit \nu}}_{{e}}}$ interaction rate ratios. Superseded by AN 2013 .
7  DENIZ 2010 observe reactor ${{\overline{\mathit \nu}}_{{e}}}{{\mathit e}}$ scattering with recoil kinetic energies $3 - 8$ MeV using CsI(Tl) detectors. The observed rate is consistent with the Standard Model prediction, leading to a constraint on sin$^2{{\mathit \theta}_{{W}}}$ = $0.251$ $\pm0.031$(stat)$\pm0.024$(sys).
8  Updated result of KamLAND, including the data used in EGUCHI 2003 . Note that the survival probabilities for different periods are not directly comparable because the effective baseline varies with power output of the reactor sources involved, and there were large variations in the reactor power production in Japan in 2003.
9  EGUCHI 2003 observe reactor neutrino disappearance at $\sim{}180~$km baseline to various Japanese nuclear power reactors.
10  BOEHM 2001 search for neutrino oscillations at $0.75$ and $0.89~$km distance from the Palo Verde reactors.
11  APOLLONIO 1999 , APOLLONIO 1998 search for neutrino oscillations at $1.1~$km fixed distance from Chooz reactors. They use ${{\overline{\mathit \nu}}_{{e}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}^{+}}{{\mathit n}}$ in Gd-loaded scintillator target. APOLLONIO 1999 supersedes APOLLONIO 1998 . See also APOLLONIO 2003 for detailed description.
12  GREENWOOD 1996 search for neutrino oscillations at 18$~$m and 24$~$m from the reactor at Savannah River.
13  DECLAIS 1994 result based on integral measurement of neutrons only. Result is ratio of measured cross section to that expected in standard $\mathit V-\mathit A$ theory. Replaced by ACHKAR 1995 .
14  KWON 1981 represents an analysis of a larger set of data from the same experiment as BOEHM 1980 .
  References:
AN 2017A
PR D95 072006 Measurement of Electron Antineutrino Oscillation Based on 1230 Days of Operation of the Daya Bay Experiment
AN 2016
PRL 116 061801 Measurement of the Reactor Antineutrino Flux and Spectrum at Daya Bay
AN 2013
CP C37 011001 Improved Measurement of Electron Antineutrino Disappearance at Daya Bay
ABE 2012
PRL 108 131801 Indication for the Disappearance of Reactor Electron Antineutrinos in the Double Chooz Experiment
AHN 2012
PRL 108 191802 Observation of Reactor Electron Antineutrino Disappearance in the RENO Experiment
AN 2012
PRL 108 171803 Observation of Electron-Antineutrino Disappearance at Daya Bay
DENIZ 2010
PR D81 072001 Measurement of ${{\overline{\mathit \nu}}_{{e}}}{{\mathit e}}$ Scattering Cross Section with a CsI(Ti) Scintillating Crystal Array at the Kuo-Sheng Nuclear Power Reactor
ARAKI 2005
PRL 94 081801 Measurement on Neutrino Oscillation with KamLAND: Evidence of Spectral Distortion
EGUCHI 2003
PRL 90 021802 First Results from KamLAND: Evidence for Reactor ${{\overline{\mathit \nu}}}$ Disappearance
BOEHM 2001
PR D64 112001 Final Results from the Palo Verde Neutrino Oscillation Experiment
APOLLONIO 1999
PL B466 415 Limits on Neutrino Oscillations from the CHOOZ Experiment
GREENWOOD 1996
PR D53 6054 Results of a Two Position Reactor Neutrino Oscillation Experiment
ACHKAR 1995
NP B434 503 Search for Neutrino Oscillations at 15, 40 and 95 Meters from a Nuclear Power Plant at Bugey
DECLAIS 1994
PL B338 383 Study of Reactor Antineutrino Interaction with Proton at Bugey Nuclear Power Plant
KUVSHINNIKOV 1991
JETPL 54 253 Measuring the ${{\overline{\mathit \nu}}_{{e}}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit n}}{{\mathit e}^{+}}$ Cross Section and $\beta $ Decay Axial Constant in a New Experiment at Rovno NPP Reactor
VUILLEUMIER 1982
PL 114B 298 New Limits on Oscillation Parameters for Electron Antineutrinos
KWON 1981
PR D24 1097 Search for Neutrino Oscillations at a Fission Reactor
BOEHM 1980
PL 97B 310 Experimental Study of Neutrino Oscillations at a Fission Reactor
APOLLONIO 1998
PL B420 397 Initial Results from the CHOOZ Long Baseline Reactor Neutrino Oscillation Experiment
APOLLONIO 2003
EPJ C27 331 Search for Neutrino Oscillations on a Long Baseline at the CHOOZ Nuclear Power Station
ABE 2012C
PR D86 112009 First Test of Lorentz Violation with a Reactor-Based Antineutrino Experiment
MUELLER 2011
PR C83 054615 Improved Predictions of Reactor Antineutrino Spectra