Journal
HYPERFINE INTERACTIONS
Volume 173, Issue 1-3, Pages 49-54Publisher
SPRINGER INTERNATIONAL PUBLISHING AG
DOI: 10.1007/s10751-007-9541-4
Keywords
masses; stored fragments; isochronous mode
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Projectile fragments separated in flight with the FRS have been injected into the storage ring ESR. Operating the ESR in the isochronous mode has enabled high-resolution mass measurements of short-lived isotopes. Already in our pilot experiments the Isochronous Mass Spectrometry (IMS) has provided accurate results for a restricted isotope range in the neighborhood of a selected isotope characterized by the best isochronous condition. In the present experiment this restriction has been overcome by precise external magnetic rigidity determination (1.5.10(-4)) at the dispersive midplane of the FRS. In this way the mass resolving power for neutron-rich fission fragments covering a large mass-over-charge ratio in one spectrum has been improved by up to one order of magnitude and the accuracy by more than a factor of two.
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