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Probing the Symmetry Energy with the Spectral Pion Ratio

Authors
Estee, J.Lynch, W. G.Tsang, C. Y.Barney, J.Jhang, G.Tsang, M. B.Wang, R.Kaneko, M.Lee, J. W.Isobe, T.Kurata-Nishimura, M.Murakami, T.Ahn, D. S.Atar, L.Aumann, T.Baba, H.Boretzky, K.Brzychczyk, J.Cerizza, G.Chiga, N.Fukuda, N.Gasparic, IHong, B.Horvat, A.Ieki, K.Inabe, N.Kim, Y. J.Kobayashi, T.Kondo, Y.Lasko, P.Lee, H. S.Leifels, Y.Lukasik, J.Manfredi, J.McIntosh, A. B.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, Z. G.Yennello, S. J.Zhang, Y.Cozma, M. D.
Issue Date
19-4월-2021
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW LETTERS, v.126, no.16
Indexed
SCIE
SCOPUS
Journal Title
PHYSICAL REVIEW LETTERS
Volume
126
Number
16
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/128225
DOI
10.1103/PhysRevLett.126.162701
ISSN
0031-9007
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.
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