The container picture with two-alpha correlation for the ground state of $^{12}$C

It is shown that the single $0^+$ THSR (Tohsaki-Horiuchi-Schuck-Röpke) wave function which is extended to include 2$α$ correlation is almost completely equivalent to the 3$α$ wave function obtained as the full solution of 3$α$ cluster model. Their squared overlap is as high as 98\% while it is 93\% if the 2$α$ correlation is not included. This result implies that, by incorporating the 2$α$ correlation in the 3$α$ model, the ground state of $^{12}$C is describable in the container picture which is valid for the Hoyle state for which the 2$α$ correlation is weak and a single $0^+$ THSR wave function without 2$α$ correlation is almost completely equivalent to the full solution of 3$α$ cluster model.

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