A variety of clustering in $^{18}$O

We investigate excited states of $^{18}$O by using the antisymmetrized molecular dynamics. It is found that five different types of cluster states exist which we call ${}^{14}{\rm C}+α$, higher-nodal ${}^{14}{\rm C}+α$, two molecular states, and $4α$ linear-chain. The calculated $α$-decay widths are compared with the observed data. The higher-nodal ${}^{14}{\rm C}+α$ cluster states reasonably agree with resonances reported by the recent experiments. We predict that the $α$-particle emission is dominant for the ${}^{14}{\rm C}+α$ cluster states while the molecular states prefer the $^{6}$He emission.

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