Gamma-ray energies and intensities observed in decay chain

Radioactive sources of the monoenergetic low-energy conversion electrons from the decay of isomeric $$^{83\textrm{m}}\mathrm {{Kr}}$$ are frequently used in the systematic measurements, particularly in the neutrino mass and dark matter experiments. For this purpose, the isomer is obtained by the decay of its parent radionuclide $$^{83}\mathrm {{Rb}}$$. In order to get more precise data on the gamma-rays occuring in the $$^{83}\mathrm {{Rb}}$$/$$^{83\textrm{m}}\mathrm {{Kr}}$$ chain, we re-measured the relevant gamma-ray spectra, because the previous measurement took place in 1976. The obtained intensities are in fair agreement with the previous measurement. We have, however, improved the uncertainties by a factor of 4.3, identified a new gamma transition and determined more precisely energies of weaker gamma transitions