Abstract
The β + -ray maximum energies of neutron-deficient 121,123,125 Ba and 121–124,126 Cs isotopes were measured using single HPGe-detector method, which does not need an annihilation-photon detection system. The radioactive sources were produced by bombarding Mo targets with 32 S 10+ and 35 Cl 11+ ions, followed by on-line mass-separation. The analysis of the experimental β + -ray spectra using response functions to monoenergetic positrons yielded β + -ray maximum energies and Q -values of orbital-electron capture ( Q EC -values) in the decay of these nuclides. The present experiment has extended the Q EC determination to 121,123 Ba isotopes in addition to improving the accuracy for the other nuclides.
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