Nuclear Spectra ofRb82andRb84

The nuclear spectra of ${\mathrm{Rb}}^{82}$ (6.3 hr) and ${\mathrm{Rb}}^{84}$ (34 days) have been measured with a magnetic lens spectrometer. ${\mathrm{Rb}}^{82}$ emits two positron groups of energies 0.775 and 0.175 Mev. It also decays by orbital electron capture. A large number of gamma-rays accompanies the disintegration (Table I). Reasonable agreement with the gamma-rays emitted by ${\mathrm{Br}}^{82}$ has been obtained. ${\mathrm{Rb}}^{84}$ emits three groups of positrons having end-point energies of 1.629, 0.822, and 0.373 Mev. One gamma-ray whose energy is 0.890 Mev has been found. Level diagrams for these disintegrations are discussed.