It is shown that the dilute density distribution of α particles in nuclei can be observed in the Airy structure in nuclear rainbow scattering. We have analyzed α+¹²C rainbow scattering to the 0₂⁺0.3em0ex(7.650.3em0exMeV) state of ¹²C in a coupled-channel method with the precise wave functions for ¹²C. It is found that the enhanced Airy oscillations in the experimental angular distributions for the 0₂⁺ state is caused by the dilute density distribution of this state in agreement for the idea of Bose-Einstein condensation of the three alpha particles.
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Ohkubo et al. (2004) studied this question.
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