Abstract

Within a programme of measuring Q EC, Q EC − S p and S p values of nuclei in the 100Sn region, the Q EC value of 105Sn was determined to be 6230 (80) keV. This result was obtained by means of the total-absorption spectrometer at the On-line Mass Separator of GSI Darmstadt. Other decay Q-values of nuclei near 100Sn, measured at this facility by investigating positron, electron-capture, β-delayed proton as well as direct proton and α-decay, are also presented. The accuracy of these data ranges from 30 to 260 keV, is thus lower than that obtained by other methods but still sufficient concerning most of the current nuclear-structure studies. Moreover, the determination of Q-values by means of decay measurements has an unrivalled sensitivity.

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