An analysis of the ${}^{12}\mathrm{C}$(${}^{12}\mathrm{C}$,$3\alpha$)${}^{12}\mathrm{C}$ reaction was made at beam energies between 82 and 106 MeV. Decays to both the ground state and the excited states of ${}^8\mathrm{Be}$ were isolated, allowing states of different characters to be identified. In particular, evidence was found for a previously observed state at 11.16 MeV. An analysis of the angular distributions of the unnatural parity states at 11.83 and 13.35 MeV, previously assigned $J^{\pi }=2^{-}$, calls into question the validity of these assignments, suggesting that at least one of the states may correspond to $J^{\pi }=4^{-}$. Evidence is also found for $1^{-}$ and $3^{-}$ strengths associated with broad states between 11 and 14 MeV.

• Received 6 June 2007

DOI:https://doi.org/10.1103/PhysRevC.76.034320