Electromagnetic Catalysis of a Neutrino Radiative decay or One More Source of Information on the Lepton Mixing Angles?

The radiative decay of ultrarelativistic massive neutrino $\nu_i \rightarrow \nu_j \gamma$ is investigated in electromagnetic fields in the framework of the Standard Model with lepton mixing. Estimates of the decay probability and ``decay cross-section'' for accelerator neutrinos of high energies in the electric field of nucleus permit one to discuss the general possibility of carrying out the neutrino experiment. Such an experiment could give unique information on mixing angles in the lepton sector of the Standard Model which would be almost independent of the specific neutrino masses.Comment: 6 pages, LaTeX, Talk given by L.A.Vassilevskaya at the XXXth Rencontres de Moriond, Electroweak Interactions and Unified Theories, Les Arcs, Savoie, France, March 11-18, 199

High-energy neutrino conversion into electron-W pair in magnetic field and its contribution to neutrino absorption

We calculate the conversion rate of high-energy neutrinos propagating in constant magnetic field into an electron-W pair (nu -> W + e) from the imaginary part of the neutrino self-energy. Using the exact propagators in constant magnetic field, the neutrino self-energy has been calculated to all order in the field within the Weinberg-Salam model. We obtain a compact formula in the limit of B << Bcr = m^2/e. We find that above the process threshold Eth \~ 2.2 10^16 (Bcr / B) eV this contribution to the absorption of neutrinos yields an asymptotic absorption length ~ 1.1 (Bcr / B)^2 (10^{16} eV / E) meters.Comment: 10 pages in RevTeX, 2 figures; published version: two typos corrected, one reference adde

Growth specifics and productivity of home and introduced artificial tree species plantations

The results of the analysis of growth rates and production of artificial plantations of local and introduced tree species are presente d. Brief information about the forests introduction in Belarus in the historical aspect is reported. Characteristics of research facilities located on the territory of the Republican biological reserve “Prylu ky” are given. All properties are in close proximity to each other in identical conditions of habitat (type of forest growth conditions D2 Kislichnaya series of forest types, soil, sod-pale-podzolic loamy medium podzolennaya, a powerful loess). The studied plantations ranged 70 to 106 years, which allows you to make objective conclusions about the success of their growth and formation. Analysis of plantation growth rates shows that hi gh productivity is characterized by 106 years old plantation of European larch and 80 years old culture of Douglas Fir (stem wood stock is respectively 695 and 740 m3/ha). Norway spruce plantations (reserv e in 71, returned more than 690 m3/ha) from the local coniferous-forest-forming species demonstrate hi gh growth rates that are not inferior to exotic species. Stocks of stem wood and the average increase in pine plantations are significantly lower (at the age of 87 respectively, 505 m 3/ha and 6.0 m3/ha per year). Pure and mixed stands of oak Northern demonstrated higher rates of growth and production compared to Quercus robur tree stands