Probing the Symmetry Energy with the Spectral Pion Ratio

J. Estee,W. G. Lynch,C.Y. Tsang,J. Barney,G. Jhang,M. B. Tsang,R. Wang,M. Kaneko,J.W. Lee,T. Isobe,M. Kurata-Nishimura,T. Murakami,D. S. Ahn,L. Atar,Thomas Aumann,H. Baba,K. Boretzky,J. Brzychczyk,G. Cerizza,Nobuyuki Chiga,N. Fukuda,I. Gasparic,B. Hong,A. Horvat,Kazuo Ieki,N. Inabe,Y. J. Kim,Toshimitsu Kobayashi,Yosuke Kondo,P. Lasko,H. S. Lee,Y. Leifels,J. Łukasik,J. Manfredi,Alan McIntosh,P. Morfouace,Takashi Nakamura,Noritsugu Nakatsuka,S. Nishimura,Hideaki Otsu,Piotr Pawłowski,K. Pelczar,D. Rossi,Hiroyoshi Sakurai,C. Santamaria,H. Sato,H. Scheit,Rebecca Shane,Yohei Shimizu,H. Simon,A. Snoch,A. Sochocka,T. Sumikama,H. Suzuki,D Suzuki,H. Takeda,S. Tangwancharoen,H. Toernqvist,Yasuhiro Togano,Zhigang Xiao,Sherry Yennello,Yingxun Zhang,M.D. Cozma,mi> π<,mi> Rit<,mrow

Probing the Symmetry Energy with the Spectral Pion Ratio

2021

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

Keywords:

Pion
Symmetry (physics)
Energy (signal processing)
Physics
Nuclear physics

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