CERN-ISOLTRAP()
HIGH-ACCURACY MASS DETERMINATION OF UNSTABLE NUCLEI WITH A PENNING TRAP MASS SPECTROMETER AT ISOLDE/CERN
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- Started: 1986,
- Completed: 9999
ISOLTRAP is a facility tailored for on-line mass measurements of short-lived unstable nuclei, which are produced at ISOLDE/CERN. The mass of a nuclide is determined by measuring the cyclotron frequency of ions stored in a Penning trap. The shortest lived nuclide that has been investigated in a Penning trap ever is 74Rb with a half-life of 65ms. The motivation for high-precision mass measurements or determination of nuclear binding energies with ISOLTRAP is manifold. First, experimental mass values with relative uncertainties of dm/m ~ 10e-6 allow to validate nuclear models which are needed to predict properties for nuclides not accessible by experiments, like the cross-sections for neutron capture along the r-process path. Second, the systematic study of nuclear binding energies dm/m ~ 10e-7 as a function of neutron and proton number yields information on nuclear structure effects like pairing, shell-closures and the onset of deformation. Third, high-precision mass values dm/m ~ 10e-8) for specific nuclides of interest contribute to test fundamental physics, like the conserved vector current (CVC) hypothesis, the unitarity of the Cabibbo-Kobayashi-Maskawa (CKM) mixing matrix, the isobaric multiplet mass equation (IMME) and the search for scalar or tensor currents in the weak interaction
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