New Isotopes of Interest to Explosive Nucleosynthesis

A number of new isotopes in the iron region, both neutron-rich and proton-rich, have been produced at the Argonne FN tandem using heavy-ion beams. On the neutron-rich side, masses and beta-decay schemes have been obtained, and the masses will be compared with various mass formulae used in nucleosynthesis calculations. Several heavy proton-rich N = Z odd-odd nuclei extending up from 62Ga have been investigated with the aim of measuring the ft-values of their superallowed Fermi decays. The resulting ft-values will be compared with those found for the well-studied lighter nuclei between 14O and 54Co.