Decay studies of N≅Z nuclei from 78Y to 102Sn

Neutron deficient nuclei near 100Sn have been produced by projectile fragmentation of a 1 A-GeV 112Sn beam in a beryllium target. The fragments were separated in the magnetic spectrometer FRS at GSI, Darmstadt. The unambiguously identified ions were stopped in a highly segmented silicon strip detector stack which was designed to measure the halflives and the total energy of emitted particles with very low background and high efficiency. We were able to study 102Sn in decay spectroscopy for the first time and establish a decay scheme for the daughter nuclide 102In. With the measurement of the halflife and the Q-value the Gamov-Teller strength could be deduced. Additionally the Q-value of 98Cd was measured with high precision and we obtained the halflives of 101Sn, 103Sn and 100In and the absolute branching ratio of beta-delayed proton emission of 101Sn. We report halflives of rp-process waiting point nuclei between 80Zr and 92,93Pd and the observation of very fast decays for the heaviest odd-odd N=Z nuclei, 90Rh, 94Ag and 98In, in agreement with superallowed Fermi transitions. In addition halflives of 75Sr, 77Y, 79Zr, 83Mo, 87Tc, 91,92,93Rh and 99In were measured. Finally, with our highly efficient identification system we were able to identify two new nuclei, 76Y and 78Zr, close to the proton dripline