Neutrinos are among the most elusive particles in the Universe. Only under extreme conditions of
density and temperature they are copiously produced. Under these conditions, they can also absorbed
and scattered by matter, providing a powerful energy source for stellar explosions. In this talk, I
will report on the role of neutrinos in the collapse of stellar iron cores (Core Collapse Supernovae)
and in the merger of two neutron stars. In particular, I will present a new effective spherically
symmetric model to trigger artificially stellar explosion, to study explosive nucleosynthesis in
supernovae.
I will also report about the first 3D simulations of the neutrino-driven wind that can occur in the
aftermath of a neutron star binary merger. Implications in terms of nucleosynthesis yields and possible
electromagnetic counterparts will also be discussed.
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