Contribution from 3 α-Condensed States to the Triple-Alpha Reaction

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Nuclear Cluster Model, Alpha Particle-Nucleus Scattering, Resonance, Scaling Phenomena, Cluster Models, Elastic And Inelastic Scattering, Other Resonances, Systems Obeying Scaling Laws

Scientific paper

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.

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