Measurements for astrophysical calculations at ISOLTRAP

With ISOLTRAP at ISOLDE/CERN mass measurements on exotic nuclides are performed down to a precision of δm/m=8.10-9. The mass as a fundamental ground state property finds applications in many theoretical calculations, especially in nuclear physics and astrophysics. In the last years part of the measurements at ISOLTRAP focussed on nuclides relevant for nucleosynthesis studies. Several measurement campaigns in 2005-2008 were dedicated to the mass determination of neutron rich nuclides close to the proton shell Z=50 and the pathway of the r-process. The masses of 112,114,116-121,123Ag and 114,120,124,126,128Cd were determined. In addition to the neutron-rich isotopes, the masses of the neutron-deficient nuclides 99-109Cd have been determined. The mass of 99Cd has been measured directly for the first time, giving a mass value close to the doubly magic 100Sn and the end-point region of the rp-process. An overview of the results and their impact on the astrophysical calculations are presented.