Abstract
With a summation-free β+-endpoint spectrometer the β+-decay energies of104Sn,147Tb,148, 149Dy,149Ho,150Er, and151Tm were remeasured with improved accuracy. Combined with known proton and alpha decay energies, the resulting QEC values lead to atomic masses of very neutron-deficient isotopes including nuclei beyond the proton drip-line such as109I and113Cs. Furthermore, the Gamow-Tellerβ-strength of the even-even nuclei104Sn,148Dy, and150Er is reevaluated with reduced uncertainty.
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Dedicated to Prof. Dr. P. Kienle on the occasion of his 60th birthday
We acknowledge the support of C. Bruske, K. Burkard, and W. Hüller in setting up the spectrometer and during the experiments at the GSI on-line mass separator. One of us (J.Ż.) is grateful for the support from the Polish Ministery of National Education under the contract G-MEN-136/90.