Mass measurements with a Penning trap mass spectrometer at ISOLDE

Penning trap mass measurements on radioactive isotopes are performed with the ISOLTRAP mass spectrometer at ISOLDE/CERN. In the last years the applicability of the spectrometer has been considerably extended. The most recent measurements were carried out on isotopes of rare earth elements and on isotopes with Z=80–85. An accuracy of δm/m≈1⋅10−7 was achieved.