New limits on naturally occurring electron capture of 123 Te

@article{Alessandrello2003NewLO,
  title={New limits on naturally occurring electron capture of 123 Te},
  author={Angelo Alessandrello and Claudio Arnaboldi and Chiara Brofferio and Silvia C. Capelli and O. Cremonesi and Ettore Fiorini and Angelo Nucciotti and Maura Pavan and Gianluigi Pessina and Stefano Pirr{\`o} and Ezio Previtali and M. Sisti and Marco Vanzini and Luca Zanotti and A. Giuliani and Marisa Pedretti and C. Bucci and Carlos Pobes},
  journal={Physical Review C},
  year={2003},
  volume={67},
  pages={014323}
}
Electron capture of ${}^{123}\mathrm{Te}$ from the K shell has been investigated in a new underground search with an array of 340-g ${\mathrm{TeO}}_{2}$ thermal detectors. We find that some previous indication of this decay could be attributed to electron capture (EC) of ${}^{121}\mathrm{Te}$ resulting from neutron activation of natural tellurium. There is therefore so far no evidence for EC of ${}^{123}\mathrm{Te}$ from the K shell with a 90% C.L. lower limit ${t}_{1/2}^{K}g5\ifmmode\times… 
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References

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TLDR
An analysis based on the expected fraction of electron captures accompanied by internal bremsstrahlung allows to set a stringent limit, independent on the decay channel, for the lifetime of {sup 123}Te.
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