[en] We consider theoretically ionization of a helium atom by impact of an electron antineutrino. The sensitivity of this process to neutrino magnetic moments is analyzed. In contrast to the recent theoretical prediction, no considerable enhancement of the electromagnetic contribution with respect to the free-electron case is found. The stepping approximation is shown to be well applicable practically down to the ionization threshold.

[en] These two slides go into detail about reactor antineutrinos and their corrections and applications.

[en] We show that comparisons between different reactor experiments do not presently allow to unambiguously prove or disprove neutrino oscillations. Requirements for new generation experiments are deduced from Monte Carlo studies. Finally, the present status and prospects of the Bugey experiment are given. 8 refs

[en] Spectra are calculated for the powerful burst of electron neutrinos and antineutrinos released when a stellar core undergoes collapse to a neutron star. These spectra can be fit quite accurately by a simple analytic expression which deviates from the Fermi--Dirac distribution with zero chemical potential in having an additional cutoff factor at high energies. The mean energies of the electron neutrinos and antineutrinos are approx. =10 and 13 MeV, respectively. The spectra will be governed chiefly by the standard process of absorption by free nucleons

[en] A measurement of the energy dependence of antineutrino disappearance at the Daya Bay reactor neutrino experiment is reported. Electron antineutrinos (${\overline{\nu }}_e$) from six $2.9{\mathrm{GW}}_{\mathrm{th}}$ reactors were detected with six detectors deployed in two near (effective baselines 512 and 561 m) and one far (1579 m) underground experimental halls. Using 217 days of data, 41 589 (203 809 and 92 912) antineutrino candidates were detected in the far hall (near halls). An improved measurement of the oscillation amplitude ${\sin }^{2}2{\theta }_{13}=0.090_{-0.009}^{+0.008}$ and the first direct measurement of the ${\overline{\nu }}_e$ mass-squared difference $\mathrm{\Delta }{m}_{ee}^2=(2.59_{-0.20}^{+0.19})\times {10}^{-3}{\mathrm{e}\mathrm{V}}^2$ is obtained using the observed ${\overline{\nu }}_e$ rates and energy spectra in a three-neutrino framework. This value of $\mathrm{\Delta }{m}_{ee}^2$ is consistent with $\mathrm{\Delta }{m}_{\mu \mu }^2$ measured by muon neutrino disappearance, supporting the three-flavor oscillation model.

[en] The ∼3σ discrepancy between the predicted and observed reactor anti-neutrino flux, known as the reactor anti-neutrino anomaly, continues to intrigue. The recent discovery of an unexpected bump in the reactor anti-neutrino spectrum, as well as indications that the flux deficit is different for different fission isotopes seems to disfavour the explanation of the anomaly in terms of sterile neutrino oscillations. We critically review this conclusion in view of all available data on electron (anti)neutrino disappearance. We find that the sterile neutrino hypothesis cannot be rejected based on global data and is only mildly disfavored compared to an individual rescaling of neutrino fluxes from different fission isotopes. The main reason for this is the presence of spectral features in recent data from the NEOS and DANSS experiments. If state-of-the-art predictions for reactor fluxes are taken at face value, sterile neutrino oscillations allow a consistent description of global data with a significance close to 3σ relative to the no-oscillation case. Even if reactor fluxes and spectra are left free in the fit, a 2σ hint in favour of sterile neutrinos remains, with allowed parameter regions consistent with an explanation of the anomaly in terms of oscillations.

[en] We analyzed the electron neutrino data of the Gallium radioactive source experiments and the electron antineutrino data of the reactor Bugey and Chooz experiments in terms of neutrino oscillations. We found a hint of a CPT-violating asymmetry of the effective neutrino and antineutrino mixing angles.

[en] We present the results of a search for MeV-scale electron antineutrino events in KamLAND coincident with the 60 gravitational wave events/candidates reported by the LIGO/Virgo collaboration during their second and third observing runs. We find no significant coincident signals within a ±500 s timing window from each gravitational wave and present 90% C.L. upper limits on the electron antineutrino fluence between 10⁸ and 10¹³ cm⁻² for neutrino energies in the energy range of 1.8–111 MeV.

[en] The KamLAND and Borexino experiments have observed, each at ∼4σ level, signals of electron antineutrinos produced in the decay chains of thorium and uranium in the Earth's crust and mantle (Th and U geoneutrinos). Various pieces of geochemical and geophysical information allow an estimation of the crustal geoneutrino flux components with relatively small uncertainties. The mantle component may then be inferred by subtracting the estimated crustal flux from the measured total flux. We find that crust-subtracted signals show hints of a residual mantle component, emerging at ∼2.4σ level by combining the KamLAND and Borexino data. The inferred mantle flux, slightly favoring scenarios with relatively high Th and U abundances, within ∼1σ uncertainties is comparable to the predictions from recent mantle models

No abstract available