Abstract
In order to investigate the nuclear symmetry energy at high density, we study the pion production in central collisions of neutron-rich nuclei at 300 MeV/nucleon using a new approach that combines antisymmetrized molecular dynamics (AMD) and a hadronic cascade model (JAM). The dynamics of neutrons and protons is solved by AMD, and then pions and resonances in the reaction process are handled by JAM. We see the mechanism by which the resonance and pions are produced, reflecting the dynamics of neutrons and protons. We also investigate the impacts of cluster correlations as well as of the high-density symmetry energy on the nucleon dynamics and consequently on the pion ratio. We find that the production ratio agrees very well with the neutron-proton squared ratio in the high-density and high-momentum region. We show quantitatively that the production ratio, and therefore , are directly reflected in the ratio, with modification in the final stage of the reaction.
3 More- Received 26 January 2016
DOI:https://doi.org/10.1103/PhysRevC.93.044612
©2016 American Physical Society