Abstract
The isotopes $^{206}\mathrm{Fr}$ and $^{208}\mathrm{Fr}$ were produced by the reactions $\mathrm{Ir}(^{20}\mathrm{Ne},xn)^{206,208}\mathrm{Fr}$ and mass separated on-line. The electron-capture and positron decays to $^{206}\mathrm{Rn}$ and $^{208}\mathrm{Rn}$ were studied by collecting $\ensuremath{\gamma}$ ray and internal conversion electron singles spectra as a function of decay time as well as $\ensuremath{\gamma}\ensuremath{-}\ensuremath{\gamma}$, $\ensuremath{\gamma}\ensuremath{-}{e}^{\ensuremath{-}}$, and $\ensuremath{\gamma}\ensuremath{-}\mathrm{x}$ ray coincidence spectra. The energies and many of the spins were determined for 18 excited, even parity states in $^{208}\mathrm{Rn}$ and for 10 excited, even parity states in $^{206}\mathrm{Rn}$. These nuclei appear to be excellent candidates for interpretation in terms of a weak coupling shell model. The energy levels were also compared to the predictions of the interacting boson approximation model.RADIOACTIVITY $^{206,208}\mathrm{Fr}$ from mass separated products of $^{\mathrm{nat}}\mathrm{Ir}(^{20}\mathrm{Ne},xn)^{206,208}\mathrm{Fr}$. Measured ${E}_{\ensuremath{\gamma}}$, ICC, $\ensuremath{\gamma}\ensuremath{-}\ensuremath{\gamma}\ensuremath{-}t$, ${e}^{\ensuremath{-}}\ensuremath{\gamma}\ensuremath{-}t$. Deduced levels $E$, $J$, $\ensuremath{\pi}$ in $^{206,208}\mathrm{Rn}$.
Published Version
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