Prerainbow Oscillations in 3He Scattering from the Hoyle State of 12c and Alpha Particle Condensation
Abstract
3He+12C scattering is studied in a coupled channel method by using a double folding model with microscopic wave functions of 12C. Experimental angular distributions in elastic and inelastic scattering to the 2+ (4.44 MeV), 0+2 (7.65 MeV) and 3- (9.63 MeV) states of 12C are well reproduced. It is found that the Airy minimum of the prerainbow oscillations for the Hoyle state is considerably shifted to a larger angle due to its dilute density distribution compared with that of the normal ground state in agreement with the idea of α particle condensation.
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