Formation of by-passed isotopes under the influence of neutrinos and possible role of neutrinos in the nucleosynthesis

The influence of neutrinos formed during the gravitational collapse of the stellar core, on the composition of the stellar envelope is considered. The processes led to an intense formation of by-passed isotopes of chemical elements are investigated. The problem on quantitative estimate of the processes is reduced to the calculation of the process ν+(A,Z)→(A,Z+1)+e- at neutrino energy Esub(ν)<30 MeV. The efficiency of the neutrino mechanism is illustrated by an example in which it was adopted that the irradiated substance contained only stable isotopes of chemical elements, these being in the same proportions as in the observed substance of the solar system. The obtained values of abundance of the major part of the by-passed isotopes reproduce quite satisfactory the shape of the curve of the by-passed isotope abundance of the solar system. A possible role of neutrinos in the general picture of the nucleosynthesis in the ejected stellar envelope cannot be constructed without accounting for the influence of neutrinos