Alpha-particle condensation in 16O via a full four-body OCM calculation
Abstract
In order to explore the 4 α-particle condensate state in 16O, we solve a full four-body equation of motion based on the 4 α OCM (Orthogonality Condition Model) in a large 4 α model space spanned by Gaussian basis functions. A full spectrum up to the 06+ state is reproduced consistently with the lowest six 0+ states of the experimental spectrum. The 0+6 state is obtained at about 2 MeV above the 4 α breakup threshold and has a dilute density structure, with a radius of about 5 fm. The state has an appreciably large α condensate fraction of 61 %, and a large component of α+12C(02+) configuration, both features being reliable evidence for this state to be of 4 α condensate nature.
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