As known, electron vacuum polarization by nuclear Coulomb field produces Uehling potential with the range $\hbar/2m_e c$. Similarly, neutrino $Z$ boson long $\sim G^2/r^5$ large $\hbar/2m_{\nu}c$. Attempts to measure parity-conserving part of this produced only limits on which are several orders magnitude higher than standard model predictions. We show that parity non-conserving (PNC) exchange ...

The influence of medium correction from an isospin dependent nucleon nucleon cross section on the fragmentation and nucleon emission in the intermediate energy heavy ion collisions was studied by using an isospin dependent quantum molecular dynamical model (IQMD). We found that the medium correction enhances the dependence of multiplicity of intermediate mass fragment Nimf and the number of nuc...