Decay ofZr83and the low-energy level structure ofY83

Decay studies of on-line mass-separated low-spin ${}_{}{}^{83}{}_{}{}^{}\mathrm{Zr}$ and ${}_{}{}^{83}{}_{}{}^{}\mathrm{Y}$ sources were carried out. γ, x-ray, conversion-electron singles and time-multiscale, and γ-γ-t measurements were used to deduce the ${}_{}{}^{83}{}_{}{}^{}\mathrm{Zr}$ decay scheme with 18 levels up to 1250 keV. The investigations establish the decay properties of ${}_{}{}^{83}{}_{}{}^{}\mathrm{Y}_{}^{\mathrm{m}}{}_{}{}^{}$ ${\mathrm{}\left(\right(3/2\mathrm{})\mathrm{}}^{\mathrm{-}}$) and do not confirm the previously proposed high-spin ${}_{}{}^{83}{}_{}{}^{}\mathrm{Zr}_{}^{\mathrm{m}}{}_{}{}^{}$(${\mathrm{T}}_{1/2}$=6 s). The low lying structure of ${}_{}{}^{83}{}_{}{}^{}\mathrm{Y}$ is compared with published theoretical calculations in terms of collective models.