Study of "condensate" states in ¹²C and ¹⁶O by inelastic scattering

Study of some properties of the lowest states of ¹²C, including the second 0⁺, 7.65 MeV (Hoyle) state by inelastic scattering of alpha-particles and ³He were carried out. Two independent methods of measuring the radii of the short-lived excited states based on the analysis of diffraction and rainbow patterns of the angular distributions were proposed. Both methods showed that Hoyle state radius is by factor ~ 1.2 – 1.3 larger than that of the ground state. ⁸Be transfer reaction was identified. The probability of L = 0 configuration in Hoyle state occurred to be 3 times larger than in the ground state indicating to the significant presence of condensate configuration in the former one. (author)