Microscopic Coupled-channels Study Of The Alpha Cluster Structures In 19Ne

Abstract

Cluster structures in 19 Ne are studied by the microscopic cluster model, the generalized twocenter cluster model (GTCM). In the GTCMcalculation, the coupled-channels problem of (3 He+ 16 O) + (α+ 15 O) is solved, and the adiabatic energy surfaces, which are the series of the energy eigenvalues as a function of the He-O distance, are investigated. In the adiabatic energy curves, the several local minima are generated in the spatial region of the small core distance, where the neutron hole inside of the He or O nucleus is strongly coupled to the residual nuclei. The energy spectra, which are constructed from the strong coupling states, nicely reproduce the the low-lying energy levels in the 19 Ne nucleus. lThe extended microscopic calculations of (3 He+ 16 O) + (α+ 15 O) + (5 He+ 14 O) are performed in order to see the coupling effect of the 5p-2h configuration, which corresponds to the shell model limit of the 5 He + 14 O cluster configuration. The extended calculation suggests that the 5 He + 14 O configuration plays an important role on the formation of the 3/2 + resonance at 0.5 MeV with respect to the α threshold.