Summing Studies of the Gamma Rays Following the Decays of ${\mathrm{Ba}}^{131}$, ${\mathrm{Se}}^{75}$, and ${\mathrm{Ru}}^{106}$

Coincidences between the gamma rays following the decays in ${\mathrm{Ba}}^{131}$, ${\mathrm{Se}}^{75}$, and ${\mathrm{Ru}}^{106}$ have been examined with the summing technique. The experimental evidences lead to a new decay scheme for ${\mathrm{Ba}}^{131}$. Some discrepancies with previous investigations are found in ${\mathrm{Se}}^{75}$, which leads to a revision of the decay scheme.