Neutrino mixing in nuclear rapid neutron-capture processes

Nucleosynthesis via Rapid Neutron Capture

I discuss the recent progress in our understanding of nucleosynthesis via rapid neutron capture, the r-process, based on meteoritic data for the early solar system and observations of stars at low metallicities. At present, all data require that there be two distinct kinds of r-process events and suggest that supernovae are associated with these events. The diversity of supernova sources for th...

Neutrino Mixing and Flavour Changing Processes

We study the implications of a large νμ-ντ mixing angle on flavour changing transitions of quarks and leptons in supersymmetric extensions of the standard model. Two patterns of supersymmetry breaking are considered, models with modular invariance and the standard scenario of universal soft breaking terms at the GUT scale. The analysis is performed for two symmetry groups G ⊗ U(1)F , with G = S...

Rapid proton capture on accreting neutron stars – effects of uncertainty in the nuclear process

The rapid proton capture process on accreting neutron stars is investigated with the use of the current nuclear data and extended nuclear reaction networks. A simple but crucial model is adopted to investigate the detailed nucleosynthesis during the burst: the plane parallel (one zone) model. Compared with the results of Hanawa et al. (1983), significant differences are found. The peak temperat...

Nuclear Halo Effects in Neutron–capture Reactions of Astrophysical Interest

The halo effect in the final states of astrophysically relevant direct neutron–capture reactions by neutron–rich nuclei is discussed. As an example, we calculate the cross sections for O(n,γ)O at thermonuclear and thermal energies.

Neutrino Mixing