41 research outputs found
A cylindrical Penning trap for capture, mass selective cooling, and bunching of radioactive ion beams
A Penning trap ion accumulator, cooler, and buncher for low energy ion beams has been developed for the ISOLTRAP mass spectrometer at ISOLDE/CERN. A cylindrical electrode configuration is used for the creation of a nested trapping potential. This is required for efficient accumulation of externally produced ions and for high mass selectivity by buffer gas cooling. The design goal of a mass resolving power of about has been achieved. Isobar separation has been demonstrated for radioactive rare earth ion beams delivered by the ISOLDE on-line mass separator
High-accuracy mass determination of neutron-rich rubidium and strontiumiIsotopes
The penning-trap mass spectrometer ISOLTRAP, installed at the on-line isotope separator ISOLDE at CERN, has been used to measure atomic masses of Rb and Sr. Using a resolving power of R 1 million a mass accuracy of typically 10 keV was achieved for all nuclides. Discrepancies with older data are analyzed and discussed, leading to corrections to those data. Together with the present ISOLTRAP data these corrected data have been used in the general mass adjustment
A linear radiofrequency ion trap for accumulation, bunching, and emittance improvement of radioactive ion beams
An ion beam cooler and buncher has been developed for the manipulation of
radioactive ion beams. The gas-filled linear radiofrequency ion trap system is
installed at the Penning trap mass spectrometer ISOLTRAP at ISOLDE/CERN. Its
purpose is to accumulate the 60-keV continuous ISOLDE ion beam with high
efficiency and to convert it into low-energy low-emittance ion pulses. The
efficiency was found to exceed 10% in agreement with simulations. A more than
10-fold reduction of the ISOLDE beam emittance can be achieved. The system has
been used successfully for first on-line experiments. Its principle, setup and
performance will be discussed
Atomic mass measurements of short-lived nuclides around the doubly-magic 208Pb
Accurate atomic mass measurements of neutron-deficient and neutron-rich
nuclides around the doubly-magic 208Pb and of neutron-rich cesium isotopes were
performed with the Penning trap mass spectrometer ISOLTRAP at ISOLDE/CERN. The
masses of 145,147Cs, 181,183Tl, 186Tlm, 187Tl, 196Tlm, 205Tl, 197Pbm, 208Pb,
190 to 197Bi, 209,215,216Bi, 203,205,229Fr, and 214,229,230Ra were determined.
The obtained relative mass uncertainty in the range of to is not only required for safe identification of isomeric states
but also allows mapping the detailed structure of the mass surface. A mass
adjustment procedure was carried out and the results included into the Atomic
Mass Evaluation. The resulting separation energies are discussed and the mass
spectrometric and laser spectroscopic data are examined for possible
correlations.Comment: 40 pages, 20 figures, accept. for publication in Nucl. Phys.