Probing neutron-proton dynamics by pions

Natsumi Ikeno, Akira Ono, Yasushi Nara, Akira Ohnishi

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41 Citations (Scopus)


In order to investigate the nuclear symmetry energy at high density, we study the pion production in central collisions of neutron-rich nuclei Sn132+Sn124 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 Δ resonances in the reaction process are handled by JAM. We see the mechanism by which the Δ 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 Δ-/Δ++ production ratio agrees very well with the neutron-proton squared ratio (N/Z)2 in the high-density and high-momentum region. We show quantitatively that the Δ production ratio, and therefore (N/Z)2, are directly reflected in the π-/π+ ratio, with modification in the final stage of the reaction.

Original languageEnglish
Article number044612
JournalPhysical Review C
Issue number4
Publication statusPublished - 2016 Apr 20

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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