Direct~Q-Value Determination of the~β-~Decay of ~187Re
Abstract
The cyclotron frequency ratio of 187Os29+ to 187Re29+ ions was measured with the Penning-trap mass spectrometer PENTATRAP. The achieved result of R=1.000\:000\:013\:882(5) is to date the most precise such measurement performed on ions. Furthermore, the total binding-energy difference of the 29 missing electrons in Re and Os was calculated by relativistic multiconfiguration methods, yielding the value of E = 53.5(10) eV. Finally, using the achieved results, the mass difference between neutral 187Re and 187Os, i.e., the Q value of the β- decay of 187Re, is determined to be 2470.9(13) eV.
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