Speaker
Description
Neutrinos play an important role for the supernova dynamics and the
associated nucleosynthesis. During collapse, electron neutrinos, produced
by electron capture on nuclei, dominate, while all neutrino families are
being produced during the cooling phase of the protoneutron star.
Neutrinos are crucial for the explosive nucleosynthesis. At first, by
interaction with free nucleons they determine the proton-to-neutron ratio
of the ejected matter which is crucial for the subsequent
nucleosynthesis. Modern supernova simulations indicate that the ejected
matter is not sufficiently neutron rich to support an r-process which also
produces the solar abundances in the third r-process peak.
Neutrino-induced spallation reactions on abundant nuclei in the outer
stellar shells are responsible for the production of selected nuclides
(neutrino nucleosynthesis). Recently the first study of neutrino
nucleosynthesis has been presented which considers the time-dependence
of the neutrino emission including the neutrino burst, the accretion phase
and the cooling phase as well as changes in the spectral forms of the
neutrinos.
