The electric monopole transition from the 1130-keV ($0^{+}$) state of ${}_{}{}^{100}{}_{}{}^{}\mathrm{Ru}$ has been found from internal-conversion-electron studies of the decay of ${}_{}{}^{100}{}_{}{}^{}\mathrm{Pd}$. The observed branching ratio of the conversion-electron emission of the crossover $E0\mathrm{}$ and cascade $E2\mathrm{}$ transitions $\frac{J_{\mathrm{eK}}\mathrm{}\left(E0\mathrm{}\right)\mathrm{}}{J_{\mathrm{eK}}\mathrm{}\left(E2\mathrm{}\right)\mathrm{}}$ is 0.075. The electric monopole strength $\rho \mathrm{}\left(E0\mathrm{}\right)\mathrm{}$ has an upper limit of 0.089.

[RADIOACTIVITY ${}_{}{}^{100}{}_{}{}^{}\mathrm{Pd}$ [from ${}_{}{}^{103}{}_{}{}^{}\mathrm{Rh}\mathrm{}(p,4n)\mathrm{}$]; measured $E_{\mathrm{ce}}$, $I_{\mathrm{ce}}$, $E_{\gamma }$, $I_{\gamma }$. ${}_{}{}^{100}{}_{}{}^{}\mathrm{Ru}$ deduced branching ratio $\frac{E0\mathrm{}}{E2\mathrm{}}$, ICC.]

• Received 7 August 1973

DOI:https://doi.org/10.1103/PhysRevC.9.1174