  Time-dependent Hartree-Fock calculations have been performed for fusion
reactions of He-4 + He-4 -> Be*-8, followed by He-4 + Be*-8 . Depending on the
orientation of the initial state, a linear chain vibrational state or a
triangular vibration is found in 12C, with transitions between these states
observed. The vibrations of the linear chain state and the triangular state
occur at ~9 and 4 MeV respectively.

Nuclear Theory