Six new short-lived Pd and Ag isotopes have been isolated from the fission products by fast chemical separations. Their decay properties have been studied by $\beta$ and $\gamma$ counting and spectroscopy or by periodic extractions of daughter activities. The nuclides described are: 1.4-min ${\mathrm{Pd}}^{113}$ decaying to 1.2-min ${\mathrm{Ag}}^{113m}$ and 5.3-hr ${\mathrm{Ag}}^{113}$; 2.4-min ${\mathrm{Pd}}^{114}$ from which 5-sec ${\mathrm{Ag}}^{114}$ was extracted; 45-sec ${\mathrm{Pd}}^{115}$ which decays to about 20-sec ${\mathrm{Ag}}^{115m}$ and 21.1-min ${\mathrm{Ag}}^{115}$; 2.5-min ${\mathrm{Ag}}^{116}$; and 1.1-min ${\mathrm{Ag}}^{117}$ which gives rise to the complicated decay chain of ${\mathrm{Cd}}^{117}$ and ${\mathrm{In}}^{117}$.

• Received 31 January 1958

DOI:https://doi.org/10.1103/PhysRev.111.228