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Evidence of bicluster structure in the ground state of $^{20}$Ne
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abstract
We explore the structure of the ground state of $^{20}$Ne by investigating various density profiles. Four candidates for the ground state configurations, (a) $j$-$j$ coupling and (b) SU(3) shell model and (c) $5\alpha$ and (d) $^{16}{\rm O}+\alpha$ cluster model configurations are generated by utilizing the antisymmetrized quasicluster model. A high-energy reaction theory, the Glauber model, relates these one-body density distributions and reaction observables. The angular distributions of the elastic scattering cross sections clearly distinguish these configurations and tell which is the most plausible one: The ground state of $^{20}$Ne favors a 16+4 nucleon bi-cluster structure. A comprehensive investigation of other electric observables also supports this conclusion.
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Directly probing existence of $\alpha$-cluster structure in $^{20}$Ne by relativistic heavy-ion collisions
In simulations of 20Ne+20Ne collisions, the scaled yield ratio of spectator neutrons to charged spectator nuclei is reduced by 20 to 25 percent when 20Ne has alpha-cluster structure, providing a proposed direct probe.
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