Coherent production of π-mesons in neutrino and antineutrino interactions on freon nuclei

The three components of the isospin triplet in the axial part of the weakly charged and neutral currents have been first observed in one experiment when studying coherent π-meson production in the neutrino and antineutrino interactions with freon nuclei. The following estimations of the corresponding cross sections of the π-meson coherent production: σcohν(π+)=(106±16)x10-40, σcohν(π-)=(113±35)x10-40, σcohν(π0)=(52±19)x10-40. The experimental data are found to be in agreement with the theoretical predictions, based on the standard model of weak interactions. The constant of the isovector axial-vector weak current β=0.99±0.20 has been defined