Abstract
When two heavy ions near the Fermi energy collide, a warm and low-density region can form in which fragments appear. This region is mainly dominated by proton and alpha particles. In such an environment, the particles interact with each other and, especially through strong resonances, form complex systems such as and . Our experiments show that reactions at MeV/nucleon levels of appear around relative energies MeV, 3.03 MeV as well as above 10 and 100 MeV. We propose a different method to derive the correlation function based on the relative transverse energy distribution to minimize the experimental uncertainties. For the systems, multiresonance processes give rise to excited levels of . In particular, the Hoyle state at 7.654 MeV excitation energy shows a decay component through the ground state of and also components where two different couples are at relative energies consistent with the ground state of at the same time.
- Received 7 March 2019
DOI:https://doi.org/10.1103/PhysRevC.99.044605
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