Search for neutrino oscillations at a fission reactor

Kwon, H.; Boehm, F.; Hahn, A.; Henrikson, H.; Vuilleumier, J. L.; Cavaignac, J.F.; Koang, D. H.; Vignon, B.; Feilitzsch, F. von; Mößbauer, R. L.

doi:10.1103/physrevd.24.1097

Cited by 134 publications

(182 citation statements)

References 43 publications

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“…nologies were used in the 23 experiments to record thē ν e capture on protons. In the ILL [28] and Goesgen experiments [29] the liquid scintillator targets cells were interspaced with the 3 He neutron counters. In the Bugey-3 experiments [30,31] the liquid scintillator was loaded with 6 Li to detect the neutron captures.…”

Section: Resultsmentioning

confidence: 99%

Reactor antineutrino anomaly with knownθ13

2013

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Section: Resultsmentioning

confidence: 99%

Reactor antineutrino anomaly with knownθ13

2013

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“…We use the data listed in table 1 of ref. [12] of the following experiments: Bugey-4 [13], Rovno91 [14], Bugey-3 [15], Gosgen [16], ILL [17,18], Krasnoyarsk87 [19], Krasnoyarsk94 [20,21], Rovno88 [22], SRP [23], Nucifer [24], Chooz [25], Palo Verde [26], Daya Bay [27], RENO [28], and Double Chooz [29]. The Daya Bay data in ref.…”

Section: Previous Reactor Ratesmentioning

confidence: 99%

Reactor fuel fraction information on the antineutrino anomaly

Giunti

Laveder

et al. 2017

J. High Energ. Phys.

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Abstract:We analyzed the evolution data of the Daya Bay reactor neutrino experiment in terms of short-baseline active-sterile neutrino oscillations taking into account the theoretical uncertainties of the reactor antineutrino fluxes. We found that oscillations are disfavored at 2.6σ with respect to a suppression of the 235 U reactor antineutrino flux and at 2.5σ with respect to variations of the 235 U and 239 Pu fluxes. On the other hand, the analysis of the rates of the short-baseline reactor neutrino experiments favor active-sterile neutrino oscillations and disfavor the suppression of the 235 U flux at 3.1σ and variations of the 235 U and 239 Pu fluxes at 2.8σ. We also found that both the Daya Bay evolution data and the global rate data are well-fitted with composite hypotheses including variations of the 235 U or 239 Pu fluxes in addition to active-sterile neutrino oscillations. A combined analysis of the Daya Bay evolution data and the global rate data shows a slight preference for oscillations with respect to variations of the 235 U and 239 Pu fluxes. However, the best fits of the combined data are given by the composite models, with a preference for the model with an enhancement of the 239 Pu flux and relatively large oscillations.

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“…[6]: Bugey-4 [7], Rovno91 [8], Bugey-3 [9], Gosgen [10], ILL [11,12], Krasnoyarsk87 [13], Krasnoyarsk94 [14,15], Rovno88 [16], SRP [17], Nucifer [18], Chooz [19], Palo Verde [20], Daya Bay [21], RENO [22], and Double Chooz [23].…”

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confidence: 99%

Improved determination of the U235 and Pu239<

Giunti

2017

Phys. Rev. D

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We present the results of a combined fit of the reactor antineutrino rates and the Daya Bay measurement of σ f,235 and σ f,239 . The combined fit leads to a better determination of the two cross sections per fission: σ f,235 = 6.29 ± 0.08 and σ f,239 = 4.24 ± 0.21 in units of 10 −43 cm 2 /fission, with respective uncertainties of about 1.2% and 4.9%. Since the respective deviations from the theoretical cross sections per fission are 2.5σ and 0.7σ, we conclude that, if the reactor antineutrino anomaly is not due to active-sterile neutrino oscillations, it is likely that it can be solved with a revaluation of the 235 U reactor antineutrino flux. However, the 238 U, 239 Pu, and 241 Pu fluxes, which have larger uncertainties, could also be significantly different from the theoretical predictions.The flux of electron antineutrinos produced in nuclear reactors is generated by the β decays of the fission products of 235 U, 238 U, 239 Pu, and 241 Pu. The 2011 recalculation [1, 2] of the four fluxes led to the discovery of the reactor antineutrino anomaly [3], which is a deficit of the rate of electron antineutrinos measured in several reactor neutrino experiments. There are two known possible explanations of the reactor antineutrino anomaly: 1) a miscalculation of one or more of the four electron antineutrino fluxes [4,5] and 2) active-sterile neutrino oscillations (see Ref.[6] and references therein). In this paper we consider the first possibility and we present an improvement of the results presented in Refs. [4,5] The cross section per fission σ f,235 of the 235 U electron antineutrino flux was determined in Ref.[4] with a fit of the reactor rates by taking into account the different fuel compositions. Recently the Daya Bay Collaboration presented a determination of σ f,235 and σ f,239 obtained by measuring the correlations between the reactor core fuel evolution and the changes in the reactor antineutrino flux and energy spectrum [5]. In this paper we present a combined fit of the reactor rates and the Daya Bay measurement of σ f,235 and σ f,239 which leads to a better determination of both cross sections per fission.In the analysis of the reactor rates, we consider the theoretical ratios [4]where f a k is the antineutrino flux fraction from the fission of the isotope with atomic mass k and the coefficient r k is the corresponding correction of the theoretical cross section per fission σ SH f,k which is needed to fit the data (k = 235, 238, 239, 241, denotes, respectively We analyze the data of the reactor rates with the leastsquares statisticwhere R exp a are the measured reactor rates listed in Table 1 of Ref. [6] and V R is the covariance matrix constructed with the corresponding uncertainties. The second term in Eq. (2) serves to keep under control the variation of the rates of the minor fissionable isotopes 238 U and 241 Pu, which are not well determined by the fit [4]. We consider ∆r 238 = 15% and ∆r 241 = 10%, which are significantly larger than the nominal theoretical uncertainties (respectively, 8.15% and...

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Search for neutrino oscillations at a fission reactor

Cited by 134 publications

References 43 publications

Reactor antineutrino anomaly with knownθ13

Reactor antineutrino anomaly with knownθ13

Reactor fuel fraction information on the antineutrino anomaly

Improved determination of the U235 and Pu239<

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