Abstract
Electron capture decay of $^{135}\mathrm{Ce}$ (17.6 h) has been used to determine the mass difference between $^{135}\mathrm{Ce}$ and $^{135}\mathrm{La}$. The main component of the positrons (0.36%/decay) was found to feed the 300 keV level in $^{135}\mathrm{La}$ with triple coincidences between two annihilation radiations and $\ensuremath{\gamma}$ rays. The end-point energy of the ${\ensuremath{\beta}}^{+}$ main component was determined to be 694 \ifmmode\pm\else\textpm\fi{} 13 keV. Thus the mass difference between $^{135}\mathrm{Ce}$ and $^{135}\mathrm{La}$ is determined to be 2016 \ifmmode\pm\else\textpm\fi{} 13 keV. No anomaly is found for the $\frac{\mathrm{EC}}{{\ensuremath{\beta}}^{+}}$ ratio.RADIOACTIVITY $^{135}\mathrm{Ce}$ [from $^{139}\mathrm{La} (p,5n)$]; measured ${E}_{\ensuremath{\beta}}$, $\ensuremath{\gamma}{\ensuremath{\gamma}}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\gamma}}^{\ifmmode\pm\else\textpm\fi{}}$ coin; deduced $Q$. Magnetic spectrometer, Ge(Li) and NaI(Tl) detectors.
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