Extreme alpha-clustering in the 18O nucleus

Details Extreme alpha-clustering in the 18O nucleus Extreme alpha-clustering in the 18O nucleus

2009-06-19

arxiv.org/abs/0906.3556v2

Eur.Phys.J.A42:135-139,2009

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 2 figures, 1 table. Resubmission with minor changes for clarity, including removal of one figure

Scientific paper

10.1140/epja/i2009-10887-1

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 not equal Z nucleus. However, the alpha-cluster structure of this nucleus is very different from the relatively simple pattern of strong alpha-cluster quasi-rotational bands in the neighboring 16O and 20Ne nuclei. 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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