1. Determination of the density region of the symmetry energy probed by the ratio.
- Author
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Yong, Gao-Chan, Gao, Yuan, Wei, Gao-Feng, Guo, Ya-Fei, and Zuo, Wei
- Subjects
- *
RADIOACTIVE nuclear beams , *NUCLEAR energy , *RADIOISOTOPES , *SYMMETRY , *DENSITY - Abstract
The nuclear symmetry energy around or below saturation density has been extensively studied and roughly pinned down, while its behavior at suprasaturation densities is rather uncertain. Related experimental studies are being carried out or planned at facilities that offer radioactive beams worldwide. Towards the physical goal of probing the nuclear symmetry energy at high densities, π measurements in the medium nuclei 132Sn + 124Sn collisions at 300 or 200 MeV/nucleon incident beam energies are ongoing at the Radioactive Isotope Beam Facility at RIKEN in Japan. However, our studies show that the observable π−/π+ ratio in the 132Sn + 124Sn reactions at 300 or 200 MeV/nucleon incident beam energies mainly probes the symmetry energy around the saturation density. Only the π−/π+ ratio in the heavy reaction system and at relatively high incident beam energies may mainly probe the symmetry energy at suprasaturation densities. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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