Insights on neutrino lensing

We discuss the gravitational lensing of neutrinos by astrophysical objects. Unlike photons, neutrinos can cross a stellar core; as a result, the lens quality improves. We also estimate the depletion of the neutrino flux after crossing a massive object and the signal amplification expected. While Ura nians alone would benefit from this effect in the Sun, similar effects coul d be considered for binary systems. (C) 2001 Elsevier Science B.V. All righ ts reserved.