Abstract
The elastic α + 8He phase shifts are calculated with a two-centre generator-coordinate method. The microscopic α and 8He internal wave functions are defined in the harmonic-oscillator model. Bound states and resonances of 12Be are obtained. Among them, a 4+ resonance with a molecular structure should be observable in elastic scattering. The parity dependence of the microscopic phase shifts is analyzed by fitting them with simple potentials. The odd-even effect is similar in the α + 8He and α + 6He phase shifts for low partial waves but decreases more rapidly with increasing orbital momentum for α + 8He.
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