Search for possible alpha-condensate states in $^{20}$Ne

The root mean square radii of $^{20}$Ne in the short-lived excited states were experimentally deduced for the first time from the analyses of $α$+$^{20}$Ne diffraction scattering. Differential cross sections of the elastic and inelastic $α$+$^{20}$Ne scattering in the incident energy range from a few MeV/nucleon up to 100 MeV/nucleon were analyzed by the modified diffraction model. No significant radius enhancement for the members of K$^π$ = 0$_{1}^{+}$ and K$^π$ = 2$^{-}$ bands in comparison with the ground state was observed. At the same time 20 % radius enhancement was obtained for the K$^π$ = 0$_{1}^{-}$ band members. Moreover, for the 0$_{2}^{+}$ state located above $α$-emission threshold increased radius was observed. This result can speak in favor of possible $α$-condensate structure of the 0$_{2}^{+}$ state and can be considered as a possible analog of the famous 7.65-MeV 0$_{2}^{+}$ Hoyle state of $^{12}$C.

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