Double Beta Decays into Excited States in $^{110}$Pd and $^{102}$Pd


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A search for double beta decays of $^{110}$Pd and $^{102}$Pd into excited states of the daughter nuclides has been performed using three ultra-low background gamma-spectrometry measurements in the Felsenkeller laboratory, Germany, the HADES laboratory, Belgium and at the LNGS, Italy. The combined Bayesian analysis of the three measurements sets improved half-life limits for the $2 ubetabeta$ and $0 ubetabeta$ decay modes of the $2^+_1$, $0^+_1$ and $2^+_2$ transitions in $^{110}$Pd to $2.9cdot10^{20}$ yr, $4.0cdot10^{20}$ yr and $3.0cdot10^{20}$ yr respectively and in $^{102}$Pd to $7.6cdot10^{18}$ yr, $8.8cdot10^{18}$ yr and $1.4cdot10^{19}$ yr respectively with 90% credibility.

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