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; Kurata-Nishimura, M; Murakami, T; Ahn, DS; Atar, L; Aumann, T; Baba, H; Boretzky, K; Brzychczyk, J; Cerizza, G; Chiga, N; Fukuda, N; Gasparic, ; Hong, B; Horvat, A; Ieki, K; Inabe, N; Kim, YJ; Kobayashi, T; Kondo, Y; Lasko, P; Lee, HS; Leifels, Y; Lukasik, J; Manfredi, J; McIntosh, AB; Morfouace, P; Nakamura, T; Nakatsuka, N; Nishimura, S; Otsu, H; Pawlowski, P; Pelczar, K; Rossi, D; Sakurai, H; Santamaria, C; Sato, H; Scheit, H; Shane, R; Shimizu, Y; Simon, H; Snoch, A; Sochocka, A; Sumikama, T; Suzuki, H; Suzuki, D; Takeda, H; Tangwancharoen, S; Toernqvist, H; Togano, Y; Xiao, ZG; Yennello, SJ; Zhang, Y; Cozma, MD. (2021) Probing the Symmetry Energy with the Spectral Pion Ratio. Physical Review Letters, 126 (16). ISSN 0031-9007

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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

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