Abstract
GSI is presently the only facility where unstable, highly charged ions far fromstability can be produced by in-flight fragmentation and subsequently stored andcooled in an ion storage ring. The mass-to-charge ratio of those stored ions ismeasured by two complementary methods that have been developed at GSI:Schottky mass-spectrometry, based on the recording of the revolutionfrequencies of electron-cooled ions, and isochronous mass-spectrometry, appliedon short-lived, uncooled ions at the ‘transition energy’. Both methodsprovide a highly efficient, precise and sensitive determination of the nuclearmass of many simultaneously stored ion species. Similarly, the βlifetimes of stored, unstable nuclei can also be determined. The impact of nuclearmasses and lifetimes for both nuclear physics and astrophysics is also addressed.
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