In 16O+16O collisions, the normalized flow ratio Norm(v2{2}/v2{4}) is mostly insensitive to tetrahedral deformation while Norm(v2{2}/v3{2}) is sensitive to both deformation and alpha-cluster correlations, but only after model dependence is controlled.
Ab initio calculation of the spectrum and structure of $^{16}$O
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We present ab initio lattice calculations of the low-energy even-parity states of $^{16}$O using chiral nuclear effective field theory. We find good agreement with the empirical energy spectrum, and with the electromagnetic properties and transition rates. For the ground state, we find that the nucleons are arranged in a tetrahedral configuration of alpha clusters. For the first excited spin-0 state, we find that the predominant structure is a square configuration of alpha clusters, with rotational excitations that include the first spin-2 state.
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Probing the tetrahedral $\alpha$ clusters in relativistic $^{16}$O + $^{16}$O collisions
In 16O+16O collisions, the normalized flow ratio Norm(v2{2}/v2{4}) is mostly insensitive to tetrahedral deformation while Norm(v2{2}/v3{2}) is sensitive to both deformation and alpha-cluster correlations, but only after model dependence is controlled.