The masses of very neutron-deficient nuclides close to the astrophysical rp-and νp-process paths have been determined with the Penning trap facilities JYFLTRAP at JYFL/Jyväskylä and SHIP-TRAP at GSI/Darmstadt. Isotopes from yttrium (Z = 39) to palladium (Z = 46) have been produced in heavy-ion fusion-evaporation reactions. In total 21 nuclides were studied and almost half of the mass values were experimentally determined for the first time:88 Tc,

The nuclides 104-108Sn, 106-110Sb, 108,109Te, and 111I at the expected endpoint of the astrophysical rp process have been produced in 58Ni+natNi fusion-evaporation reactions at IGISOL and their mass values were precisely measured with the JYFLTRAP Penning trap mass spectrometer. For 106Sb, 108Sb, and 110Sb these are the first direct experimental mass results obtained. The related one-proton separation energies have been derived and the value for 106Sb, Sp=424(8) keV, shows that the branching into the closed SnSbTe cycle in the astrophysical rp process is weaker than expected.

This is a self-archived version of an original article. This version may differ from the original in pagination and typographic details.

Decay properties of neutron-deficient exotic nuclei close to A = 80 have been investigated at the IGISOL facility. The studied nuclei, 81 Y, 81 Sr, 81m Kr, 85 Nb, 85 Zr, 86 Mo and 86 Nb, were produced by a 32 S beam from the Jyväskylä isochronous cyclotron on 54 Fe and nat Ni targets. The internal conversion coefficient for a 190.5 keV isomeric transition in 81m Kr has been measured and the internal transition rate has been determined. The internal transition rate has been used to estimate a neutrino capture rate on 81 Br, which yields a log ft of 5.13 ± 0.09 for the reaction 81 Br(ν, e −) 81m Kr. A new isomer with a half-life of 3.3 ± 0.9 s has been observed in 85 Nb. The existence of an earlier reported isomer with a half-life of 56 s in 86 Nb has not been confirmed.

No abstract