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Probing the Symmetry Energy with the Spectral Pion Ratio

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arxiv 2103.06861 v1 pith:S3RLG4S5 submitted 2021-03-11 nucl-ex

J. Estee , W.G. Lynch , C.Y. Tsang , J. Barney , G. Jhang , M.B. Tsang , R. Wang , M. Kaneko
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J.W. Lee T. Isobe M. Kurata-Nishimura T. Murakami D.S. Ahn L. Atar T. Aumann H. Baba K. Boretzky J. Brzychczyk G. Cerizza N. Chiga N. Fukuda I. Gasparic B. Hong A. Horvat K. Ieki N. Inabe Y.J. Kim T. Kobayashi Y. Kondo P. Lasko H. S. Lee Y. Leifels J. {L}ukasik J. Manfredi A. B. McIntosh P. Morfouace T. Nakamura N. Nakatsuka S. Nishimura H. Otsu P. Paw{l}owski K. Pelczar D. Rossi H. Sakurai C. Santamaria H. Sato H. Scheit R. Shane Y. Shimizu H. Simon A. Snoch A. Sochocka T. Sumikama H. Suzuki D. Suzuki H. Takeda S. Tangwancharoen H. Toernqvist Y. Togano Z. G. Xiao S. J. Yennello Y. Zhang M.D. Cozma
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abstract

Many neutron star (NS) properties, such as the proton fraction within a NS, reflect the symmetry energy contributions to the Equation of State that dominate when neutron and proton densities differ strongly. To constrain these contributions at supra-saturation densities, we measure the spectra of charged pions produced by colliding rare isotope tin (Sn) beams with isotopically enriched Sn targets. Using ratios of the charged pion spectra measured at high transverse momenta, we deduce the slope of the symmetry energy to be $42 < L < 117$ MeV. This value is slightly lower but consistent with the $L$ values deduced from a recent measurement of the neutron skin thickness of $^{208}$Pb.

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Forward citations

Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Femtoscopy Measurement with S$\pi$RIT TPC in Radioactive BeamHeavy-ion Collisions

    physics.ins-det 2026-07 conditional novelty 5.0 of 10

    A first proton-proton femtoscopy correlation function measured with the SπRIT TPC in 132Sn+124Sn collisions at 270 MeV/u shows the expected attractive-interaction peak near 20 MeV/c.

  2. Novel Scalings of Neutron Star Properties from Analyzing Dimensionless Tolman--Oppenheimer--Volkoff Equations

    astro-ph.HE 2025-01 reject novelty 3.0 of 10

    IPAD-TOV is a perturbative analysis of dimensionless TOV equations yielding claimed EOS-model-independent scalings and a bound X=Pc/εc≤0.374, used to extract central EOS from NS observations.

  3. Toward a Unified Understanding of the Dense Matter Equation of State

    nucl-th 2025-11 conditional novelty 2.0 of 10

    A review of three Bayesian/computational frameworks for combining heavy-ion and astrophysical constraints on the dense-matter equation of state, plus a proposed unified integration workflow.

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