Efimov States From Triple α Resonances
2019
The Efimov trimers in excited 12 C nuclei, which no observation exists yet, are discussed by means of analyzing the experimental data of 70(64) Zn( 64 Ni) + 70(64) Zn( 64 Ni )reactions at beam energy of E/A=35 MeV/nucleon. In heavy ion collisions, the α s interact with each other and can form complex systems such as 8 Be and 12 C. For the 3 α systems, multi resonance processes give rise to excited levels of 12 C. The interaction between any two of the 3 α particles provides events with one, two or three 8 Be. Their interfering levels are clearly seen in the minimum relative energy distributions. Events of three couple α relative energies consistent with the ground state of 8 Be are observed with the decreasing of the instrumental error at the reconstructed 7.458 MeV excitation energy of 12 C, which was suggested as the (Thomas) Efimov state.
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