Probing the Symmetry Energy with the Spectral Pion Ratio

(SπRIT Collaboration) Estee, J; Lynch, WG; Tsang, CY; Barney, J; Jhang, G; Tsang, MB; Wang, R; Kaneko, M; Lee, JW; Isobe, T et al. [Show all] (2021) Probing the Symmetry Energy with the Spectral Pion Ratio. Physical Review Letters, 126 (16). ISSN 0031-9007

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Official URL: http://doi.org/10.1103/physrevlett.126.162701

Abstract

Many neutron star properties, such as the proton fraction, reflect the symmetry energy contributions to the equation of state that dominate when neutron and proton densities differ strongly. To constrain these contributions at suprasaturation 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 Pb-208.

Item Type:

Article

Uncontrolled Keywords:

Nuclear equation of states; symmetry energy; heavy-ion collisions; pions

Subjects:

NATURAL SCIENCES > Physics

Divisions:

Division of Experimental Physics

Projects:

Project title	Project leader	Project code	Project type
Zemljovid atomskih jezgara - neutronski bogata strana-NeRiS-Land	Suzana Szilner	IP-2018-01-1257	HRZZ
Nuklearna struktura i reakcije: eksperimentima prema neutronskoj liniji kapanja-SR-ETNo	Suzana Szilner	IP-2013-11-7194	HRZZ

Depositing User:

Lorena Palameta

Date Deposited:

29 Apr 2025 07:25

URI:

http://fulir.irb.hr/id/eprint/9769

DOI:

10.1103/physrevlett.126.162701