Inverse Beta Decay and the Two-Component Neutrino

King, Richard; Perkins, J. F.

doi:10.1103/physrev.112.963

Cited by 30 publications

(18 citation statements)

References 7 publications

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“…(3.8), rather than using a detailed reactor model with all distinct processes explicitly included, to calculate f T (E ν ) we replace the sums by integrals over endpoint energies. We use a gaussian distribution for W (∆) [40] peaked at 1.7 MeV and with σ = 2.5 MeV, which approximates well the phenomenological distribution (see e.g. Refs.…”

Section: Oscillations In Eftmentioning

confidence: 99%

Reactor neutrino oscillations as constraints on effective field theory

Falkowski

González–Alonso

Tabrizi

2019

J. High Energ. Phys.

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We study constraints on the Standard Model Effective Field Theory (SMEFT) from neutrino oscillations in short-baseline reactor experiments. We calculate the survival probability of reactor antineutrinos at the leading order in the SMEFT expansion, that is including linear effects of dimension-6 operators. It is shown that, at this order, reactor experiments alone cannot probe charged-current contact interactions between leptons and quarks that are of the (pseudo)vector (V±A) or pseudo-scalar type. We also note that flavor-diagonal (pseudo)vector coefficients do not have observable effects in oscillation experiments. In this we reach novel or different conclusions than prior analyses of non-standard neutrino interactions. On the other hand, reactor experiments offer a unique opportunity to probe tensor and scalar SMEFT operators that are offdiagonal in the lepton-flavor space. We derive constraints on the corresponding SMEFT parameters using the most recent data from the Daya Bay and RENO experiments.

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Section: Oscillations In Eftmentioning

confidence: 99%

Reactor neutrino oscillations as constraints on effective field theory

Falkowski

González–Alonso

Tabrizi

2019

J. High Energ. Phys.

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“…1 Short history Alvarez (unpublished report, 1949 y) did historically the first estimation of the reactorν e spectrum using conception of fission radiation developed by K. Way and E. Wigner [3]. The next were Perkins and King in 1958 y [4]. These studies were stimulated by B. Pontecorvo's proposal to look for Cl ⇒ Ar transitions near atomic reactor (1946 y) and by famous F. Reines − C. Cowan experiments.…”

Section: Introductionmentioning

confidence: 99%

Components of antineutrino emission in nuclear reactor

Копейкин¹,

Mikaelyan²,

Sinev³

2004

Phys. Atom. Nuclei

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Newνe, e scattering experiments aimed for sensitive searches of the νe magnetic moment and projects to explore small mixing angle oscillations at reactors call for a better understanding of the reactor antineutrino spectrum. Here we consider six components, which contribute to the total νe spectrum generated in nuclear reactor. They are: beta decay of the fission fragments of 235 U, 239 Pu, 238 U and 241 Pu, decay of beta-emitters produced as a result of neutron capture in 238 U and also due to neutron capture in accumulated fission fragments which perturbs the spectrum. For antineutrino energies less than 3.5 MeV we tabulate evolution ofνe spectra corresponding to each of the four fissile isotopes vs fuel irradiation time and their decay after the irradiation is stopped and also estimate relevant uncertainties. Small corrections to the ILL spectra are considered.1 Here F N ≈ 5.5ν e /fission represents summed contribution from beta decays of fission fragments of four fissile isotopes 235 U, 239 Pu, 238 U and 241 Pu, undistorted by their interaction with reactor neutrons, U N ≈ 1.2ν e /fission comes from beta decay of 239 U ⇒ 239 Np ⇒ 239 Pu chain produced via neutron radiative capture in 238 U and δ F N < 0.03ν e /fission originate from neutron capture in accumulated fission fragments and give small but not negligible local distortions of the total energy spectrum of the reactorν e .Plan of this report is as follows: First, we present a short (and incomplete) overview of a half a century long history, which has led to the present understanding of the reactor antineutrinos.Second, we give new results on the computed evolution ofν e energy spectra corresponding to four fissile isotopes vs fuel irradiation time and their decay after the end of the irradiation; we compare all available data and estimate relevant uncertainties.After these data are presented on antineutrinos due to neutron radiative capture in 238 U and in accumulated fission fragments.Finally we consider small corrections to the ILL spectra.

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“…The SM model is the only tool which allows one to study the components of the reactor antineutrino energy spectrum and to predict reactor antineutrino spectra over the full energy range from any fuel and under any irradiation conditions. This method, originally proposed in [24] followed by [25] and then by [26,27] relies completely on the available nuclear data of the fission yields combined with the beta decay data for the fission products. It was revisited at the same time as the conversion method [10], leading to the conclusion that the Pandemonium effect [28] affects some of the nuclear beta decay data that play an important role in the calculation of the antineutrino energy spectrum [29].…”

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confidence: 99%

Updated Summation Model: An Improved Agreement with the Daya Bay Antineutrino Fluxes

et al. 2019

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A new summation method model of the reactor antineutrino energy spectrum is presented. It is updated with the most recent evaluated decay databases and with our Total Absorption Gammaray Spectroscopy measurements performed during the last decade. For the first time the spectral measurements from the Daya Bay experiment are compared with the detected antineutrino energy spectrum computed with the updated summation method without any renormalisation. The results exhibit a better agreement than is obtained with the Huber-Mueller model in the 2 to 5 MeV range, the region which dominates the detected flux. An unexpected systematic trend is found that the detected antineutrino flux computed with the summation model decreases with the inclusion of more Pandemonium free data. The detected flux obtained now lies only 1.9% above that detected in the Daya Bay experiment, a value that may be reduced with forthcoming new Pandemonium free data leaving less and less room to the reactor anomaly. Eventually, the new predictions of individual antineutrino spectra for the 235 U, 239 Pu, 241 Pu and 238 U are used to compute the dependence of the reactor antineutrino spectral shape on the fission fractions.

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Inverse Beta Decay and the Two-Component Neutrino

Cited by 30 publications

References 7 publications

Reactor neutrino oscillations as constraints on effective field theory

Reactor neutrino oscillations as constraints on effective field theory

Components of antineutrino emission in nuclear reactor

Updated Summation Model: An Improved Agreement with the Daya Bay Antineutrino Fluxes

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