The multichannel three-body model is applied to the ($n\alpha \alpha$) system to study the bound states of ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$. The $\alpha$ particle involved in this system is assumed to be a two-level particle to take care of its internal structure. The energies of the ground state [${\frac{3}{2}}^{-}$] and an excited state [${\mathrm{½}}^{+}$] are calculated to be -1.76 and +0.68 MeV, respectively.

[NUCLEAR STRUCTURE ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$; calculated levels. Multichannel three-body model.]

• Received 10 January 1974

DOI:https://doi.org/10.1103/PhysRevC.9.2086