Speaker
Description
Symmetry energy, closely tied to the isospin dimension of the equation of state for nuclear matter, connects the fundamental properties of microscopic atomic nuclei and macroscopic neutron stars. In terrestrial laboratories, heavy-ion collisions offer a unique way to investigate the characteristics of symmetry energy. After over a decade of dedicated research, a Compact Spectrometer for Heavy Ion Experiments (CSHINE) has been successfully developed, and multiple experiments have been carried out using this facility.
In this talk, two previous works on isospin chronology [Phys. Lett. B, 825, 136856 (2022)] and isospin "ping-pang" emission [Phys. Rev. C, 107, L041601 (2023)] will be briefly reviewed. A recently completed study on the enhancement of neutron-rich particle emission from the out-of-fission-plane region in 25 MeV/u Kr+Pb reactions will then be discussed in detail [Nuclear Science and Techniques, 36, 155 (2025)].
In this study, the "³He-puzzle" in the energy spectrum was observed even during the fast fission process. Using a data-driven energy-spectrum peak-cutting scheme, it was found that the yield ratio R(t/³He) increases with the angle relative to the fission plane, indicating a significant enhancement of neutron-rich particle emission from the out-of-fission-plane. This phenomenon reveals the isospin distribution in fast fission processes and provides a novel probe for investigating nuclear symmetry energy during fast fission.
Finally, a discussion will be presented on the challenges encountered in our research and the future directions required for both experimental and theoretical investigations.
| Presentation Style | Oral Presentation |
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