THE RADIATIVE DECAY OF A HIGH-ENERGY NEUTRINO IN THE COULOMB FIELD OFA NUCLEUS

In the framework of the Standard Model with lepton mixing the radiativ e decay nu(i) --> nu(j)gamma of a neutrino of high (E(nu) approximatel y 100 GeV) and super-high (E(nu) greater-than-or-equal-to 1 TeV) energ y is investigated in the Coulomb field of a nucleus. Estimates of the decay probability and ''decay cross-section'' for neutrinos of these e nergies in the electric field of a nucleus permits one to discuss the general possibility of carrying out a neutrino experiment, subject to the condition of availability in the future of a beam of neutrinos of these high energies. Such an experiment could give unique information on mixing angles in the lepton sector of the Standard Model which woul d be independent of the specific neutrino masses if only the threshold factor (1 - m(j)4/m(j)4) was not close to zero.