Evaluation of the average β and γ energies data of β^--decay nuclei

The average β and γ energies data of the β^{\protect \relax \special {t4ht=-}}-decay nuclei plays an important role in many fields of nuclear technology and applied science. This work proposes an integral set of evaluation principles for average β- and γ-energy data and presents a systematic evaluation of 1136 β^{\protect \relax \special {t4ht=-}}-decay nuclei for which experimental data are available to date. The quality of the average energy data is assessed, and the data are updated where possible. As a result, the average β and γ energies data of only 448 nuclei were deemed reliable according to the evaluation criterion, while another 95 nuclei were considered acceptable when the criterion was relaxed. Of these data for 92 nuclei were updated in this work. Among the 1136 nuclei, 146 are likely affected by the pandemonium effect and thus require new measurements. From the systematic analysis of the recommended data, nuclei that are further from the β-stability line and those near both the proton and neutron magic numbers tend to have large average β and γ energies. Moreover, the average β energy exhibits much clearer regularity than the average γ energy.