Speaker
Description
The quark-meson coupling (QMC) model incorporates quark degrees of freedom, unlike the quantum hadro-dynamics (QHD) model. Using the mean-field approximation, the QMC model has been applied to nuclear matter, neutron stars, finite nuclei, and related systems. In this work, we investigate heavy-ion collisions by incorporating the QMC model into the Daejeon Boltzmann-Uehling-Ulenbeck (DJBUU) transport model. We present simulation results for Au + Au and Sn + Sn collisions using both QMC- and QHD-based interactions for comparison. For Au + Au collisions, the QMC interaction successfully reproduces the transverse and directed flows, in agreement with the corresponding QHD results and experimental data. Although the QMC model has a larger incompressibility than QHD, it yields a higher baryon density in the compressed stage. This difference strongly influences the in-medium modification of Δ production; by tuning the in-medium modification parameters, we can reproduce pion observables in Sn + Sn collisions with the QMC interaction. Our results confirm the feasibility of implementing QMC interactions in heavy-ion collision simulations. This study paves the way for studying quark degrees of freedom in intermediate-energy heavy-ion collisions.
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