Elsevier

Nuclear Physics A

Volume 626, Issues 1–2, 17 November 1997, Pages 343-352
Nuclear Physics A

Direct mass measurements of unstable rare earth isotopes with the ISOLTRAP mass spectrometer

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Abstract

Direct mass measurements of neutron deficient rare earth isotopes in the vicinity of 146Gd were performed for the first time with the Penning trap mass spectrometer ISOLTRAP at ISOLDE/CERN. Since ISOL-facilities deliver these isotopes with a large amount of isobaric contamination, these measurements became possible only after the installation of a new cooler trap which acts as an isobar separator. To date more than 40 isotopes of the elements Pr, Nd, Pm, Sm, Eu, Dy, and Ho have been measured with a typical accuracy of δm ≈ 14 keV. Some of these isotopes provide an important anchor for many other isotopes linked by known Q-values.

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