[en] The MiniBooNE experiment at Fermi National Accelerator Laboratory recently updated a search for ν-bar_e appearing in an ν-bar_μ beam to include higher statistics. Previous results were published with a total of 3.39x10²⁰ protons on target (POT) [A.A. Aguilar-Arevalo, et al., Phys. Rev. Lett. 103 (2009) 111801, (arXiv:0904.1958)], while these results have been expanded to include a total of 5.66x10²⁰ POT [A.A. Aguilar-Arevalo, et al., Phys. Rev. Lett. 105 (2010) 181801, (arXiv:1007.1150)]. An excess of 20.9±14.0 events is observed in the energy range from 475< E_ν^QE cance of the excess peaking at 25.7±7.2 in the lowest two energy bins 475-675MeV. The consistency with the background-only hypothesis in the 475-1250MeV region is 0.5%, after constraints from the measured ν-bar_μ spectrum have been applied. A fit to a 2ν-mixing hypothesis yields a best-fit point at (Δm²,sin²2θ)=(0.064eV²,0.96), although the 1σ allowed region encompasses a range of Δm² values up to 1eV² at reduced values of sin²2θ. After Feldman-Cousins corrections [G. Feldman, R. Cousins, Phys. Rev. D 57 (1998) 3873-3889, (arXiv:physics/9711021)], it is found that the best-fit is preferred at a 99.4% C.L. over a background-only hypothesis, with an absolute goodness-of-fit of 8.7%

No abstract available

[en] Cross sections calculated with a new standard reactor antineutrino spectral function are in good agreement with new experimental data. (authors)

[en] Short note

[en] We report preliminary two position daa from the Irvine Neutrino Oscillation Experiment. A three standard deviation exclusion region is obtained for the parameters sin²2θ and δm²

[en] MiniBooNE began running in antineutrino mode on 19 January, 2006. We describe the sensitivity of MiniBooNE to LSND-like (bar ν)_e oscillations and outline a program of antineutrino cross-section measurements necessary for the next generation of neutrino oscillation experiments. We describe three independent methods of constraining wrong-sign (neutrino) backgrounds in an antineutrino beam, and their application to the MiniBooNE antineutrino analyses

[en] Discussed is the problem of deviation between experimental cross section average σsub(exp) of the anti νsub(e) + p → n + e⁺ reaction measured by Nezrick and Reines, and a theoretical cross section average σsub(theor) calculated on the basis of recent data. The usage of the data disturbs a good coincidence of average σsub(exp) and average σsub(theor), their difference exceeding two experimental errors. The above fact may be explained by statistical fluctuations or by methodological errors not taken into account. Accumulation of ²³⁹Pu in the reactor and existence of neutrino oscillations are considered as physical reasons leading to the reduction of average σsub(exp)

[en] The counting rates of events in the ν-tilde_e+p → e⁺+n reaction at the distance of 18-25 m from reactor are determined. Intensity drop with the distance within statistics (31.6 thous. of detected ν-tilde_e) agrees with the one expected in geometry. In two-state model restrictions to Pontekorvo oscillation parameters are found. The results are compared with those of French group informed on deviation from geometry in the similar experiment at 13.6 and 18.3 distance from the reactor

[en] The spectrum of positrons from the reaction antiν_e + p #-> # e⁺ = n was measured at three distances, 37.9, 45.9 and 64.7, from the core of the Goesgen reactor. These data were analyzed in terms of neutrino oscillations of the type antiν_e ↔ X. No evidence for neutrino oscillations was found. In particular the oscillation parameter region favoured by an experiment at the Bugey reactor is not supported by the data presented here. 9 refs

[en] The problem is considered of a discrepance between the experimental cross section of the reaction anti νsub(e) + p→n+e⁺ measured by Nezrick and Reines, and the theoretical quantity calculated basing on recent data. Possible reasons for the discrepance are shown