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