Probing neutron-proton dynamics by pions

Natsumi Ikeno, Akira Ono, Yasushi Nara, and Akira Ohnishi
Phys. Rev. C 93, 044612 – Published 20 April 2016; Erratum Phys. Rev. C 97, 069902 (2018)

Abstract

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.

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  • Received 26 January 2016

DOI:https://doi.org/10.1103/PhysRevC.93.044612

©2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Erratum

Erratum: Probing neutron-proton dynamics by pions [Phys. Rev. C 93, 044612 (2016)]

Natsumi Ikeno, Akira Ono, Yasushi Nara, and Akira Ohnishi
Phys. Rev. C 97, 069902 (2018)

Authors & Affiliations

Natsumi Ikeno

  • Department of Regional Environment, Tottori University, Tottori 680-8551, Japan

Akira Ono

  • Department of Physics, Tohoku University, Sendai 980-8578, Japan

Yasushi Nara

  • Akita International University, Akita 010-1292, Japan

Akira Ohnishi

  • Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan

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Issue

Vol. 93, Iss. 4 — April 2016

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