Three-alpha structures in C-12

Abstract

We search for three-alpha resonances in C-12 by using the complex scaling method in a microscopic cluster model. All experimentally known low-lying natural-parity states are localized. For the first time we unambiguously show that the 0+2 state in C-12, which plays an important role in stellar nucleosynthesis, is a genuine three-alpha resonance.

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