2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/82447An attempt is made to estimate the velocity $V_ν$ of electron antineutrino by using a theory of nuclear reactions \cite{1}. To estimate it, the experimental values of absorption cross sections $\mathbfσ% _{a}(\widetildeν_{e})$ and $\mathbfσ_{a}(n)$ for electron antineutrinos and neutrons by nuclei are compared. Based on the approach proposed below, one could assume that the maximum velocity at weak interactions $c_{w}>c,$ which is inconsistent with the theory of relativity (TR)3 pages LaTeXNuclear Theorytext