Extreme alpha-clustering in the O-18 nucleus
2009
The structure of the 18O nucleus at excitation energies above the $ \alpha$
decay threshold was studied using 14C + $ \alpha$
resonance elastic scattering. A number of states with large $ \alpha$
reduced widths have been observed, indicating that the $ \alpha$
-cluster degree of freedom plays an important role in this N
$ \ne$
Z nucleus. A 0+ state with an $ \alpha$
reduced width exceeding the single-particle limit was identified at an excitation energy of 9.9±0.3 MeV. We discuss evidence that states of this kind are common in light nuclei and give possible explanations of this feature.
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