Microscopic investigation of the α+18O system in a three-cluster model

The Ne22 spectrum is investigated with microscopic wave functions defined in the generator-coordinate formalism. This nucleus is described in a three-cluster model, involving an O16 core surrounded by a dineutron and an particle. The O18 cluster is projected out on the 0+ and 2+ states. We propose a band structure of Ne22 with experimental candidates. The model suggests the existence of a 0+ band presenting a marked +18O cluster structure. We present the +18O(0+,2+) collision matrices, and discuss the resonance properties in the (18)18O scattering. Electromagnetic transition probabilities in the Ne22 nucleus are calculated. From the theoretical Coulomb shifts between the mirror Ne22 and Mg22 nuclei, we suggest spin assignments for different Mg22 states. The (18,)22Ne capture cross section is calculated, and is used for determining microscopically the nonresonant reaction rate. © 1988 The American Physical Society.
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