α cluster structures in unbound states of ¹⁹Ne

Cluster structures in ¹⁹Ne are studied by the microscopic and macroscopic cluster models. In the microscopic calculation, the coupled-channels problem of (α + ¹⁵O) + (³He + ¹⁶O) are solved, and the calculated energy spectra nicely reproduce the low-lying levels. In the macroscopic approach, the α + ¹⁵O potential model is applied. The calculation of the potential model predicts the existence of the resonances above the α threshold, which has a weak-coupling structure of the α particle plus one hole inside of the ¹⁶O nucleus. The coupling effect of the 5p-2h configuration to ¹⁹Ne is briefly discussed. (authors)