Comparison between Direct Mass Measurements and Determinations of Beta Endpoint Energies of Neutron Rich Rb and Cs Isotopes
Recent direct mass measurements are compared to precise Qβ-values. The corresponding beta spectra were recorded with an intrinsic Ge-detector which was calibrated with conversion electrons from the BILL spectrometer. By the use of a magnetic pre-separation recently only the high energy portion of the beta spectrum was recorded. Thus count rate limitations of the beta detector were circumvented allowing the use of stronger β-sources and yielding beta spectra with essentially zero background.
KeywordsDaughter Nucleus Plastic Scintillator Neutron Rich Nucleus Mass Excess Tantalum Foil
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