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Exploring new mass regions with the ISOLTRAP spectrometer


First direct mass measurements on rare earth isotopes around 146Gd have been performed with the Penning trap mass spectrometer ISOLTRAP at ISOLDE/CERN. More than 40 isotopes of the elements Pr, Nd, Pm, Sm, Eu, Dy and Ho have been measured with an accuracy of typically 1 × 10-7. In the case of 141Sm isomeric and ground state (ΔE = 175 keV) were resolved. Since isobaric contaminations are present in the ISOLDE beam, these measurements on rare earth isotopes became only possible after the installation of a new cooler trap which acts an isobar separator.

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Beck, D., Ames, F., Audi, G. et al. Exploring new mass regions with the ISOLTRAP spectrometer. Hyperfine Interactions 108, 219–225 (1997).

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  • Mass Measurement
  • Cyclotron Frequency
  • Accurate Mass Measurement
  • Ground State Mass
  • Cool Trap