Prerainbow Oscillations in $^3$He Scattering from the Hoyle State of   $^{12}$c and Alpha Particle Condensation
  $^3$He+$^{12}$C scattering is studied in a coupled channel method by using a double folding model with microscopic wave functions of $^{12}$C. 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 $^{12}$C 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 $\alpha$ particle condensation. 
S. Ohkubo and Y. Hirabayashi
nucl-th nucl-ex