Radioactive Decays ofRh106andAg106

Abstract

Transitions in ${\mathrm{Pd}}^{106}$ occurring in the decays of ${\mathrm{Rh}}^{106}$ and ${\mathrm{Ag}}^{106}$ have been examined with a three-crystal pair spectrometer using gray-wedge pulse-height analysis, single and coincidence scintillation spectrometer techniques and an intermediate-image beta-ray spectrometer. In addition to lines previously known, gamma rays of 1.77, 1.96, 2.10, and 2.66 Mev and a possible gamma ray of 1.14 Mev are found in ${\mathrm{Rh}}^{106}$ decay. Gamma rays of energies 0.22, 0.409, 0.51, 0.62, 0.72, 0.805, 1.045, 1.131, 1.205, 1.23, 1.39, 1.55, 1.77, 1.85, 2.1, and 2.63 Mev are observed in ${\mathrm{Ag}}^{106}$ decay. Most of the data can be satisfied by postulating in addition to the five previously known states in ${\mathrm{Pd}}^{106}$ three new weakly excited levels at 1.85, 2.27, and 2.66 Mev. A lower limit of ∼${10}^{-8\mathrm{}}$ sec is estimated for the partial half-life of the 0-0 transition between the second excited and ground states of ${\mathrm{Pd}}^{106}$.