Momentum distributions from three-body decaying 9Be and 9B resonances

The complex-rotated hyperspherical adiabatic method is used to study the decay of low-lying ${}^9$Be and ${}^9$B resonances into $\alpha$, $\alpha$ and $n$ or $p$. We consider six low-lying resonances of ${}^9$Be ($1\mathrm{/}{2}^{\pm }$, $3\mathrm{/}{2}^{\pm }$ and $5\mathrm{/}{2}^{\pm }$) and one resonance of ${}^9$B ($5\mathrm{/}{2}^{-}$) to compare with. The properties of the resonances at large distances are decisive for the momentum distributions of the three decaying fragments. Systematic detailed energy correlations of Dalitz plots are presented.