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The α-condensed state in nuclear systems has been proposed by Tohsaki et al. and has given rise to interesting discussions. The Hoyle state of 12C has been studied as the most typical example of such an α-condensed state. A new resonant 03+ state (Er = 1.66 MeV, Γ = 1.48 MeV) is predicted as an excited α-condensed state in addition to the second 0+ state of the Hoyle state by calculations of the 3 α orthogonality condition model (3 α OCM) using the complex scaling method. Based on this result, the breakup strengths of the inversion reaction for sequential (8Be+α→12C+γ) and direct (α+α+α→12C+γ) processes are calculated. It is discussed that a large reaction strength calculated recently by Ogata et al. in non-resonant energies is considered as a contribution from the excited 03+ state. [ABSTRACT FROM AUTHOR]

Three-alpha resonant states in 12C are investigated by using the method of Analytic Continuation in the Coupling Constant combined with the Complex Scaling Method (ACCC+CSM). We obtain the 03+ resonant state at the energy Er = 1.66 MeV and the width Γ = 1.48 MeV, which seems to have a similar structure to that of the 02+ state. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]