Symmetry energy investigation with pion production from Sn+Sn systems

• DOI: 10.1016/j.physletb.2020.136016
• Publication Date: 2020-12-17T01:24:15Z
• Authors: G. Jhang; J. Estee; J. Barney; G. Cerizza; M. Kaneko; J.W. Lee; W.G. Lynch; T. Isobe; M. Kurata-Nishimura; T. Murakami; C.Y. Tsang; M.B. Tsang; R. Wang; D.S. Ahn; L. Atar; T. Aumann; H. Baba; K. Boretzky; J. Brzychczyk; 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. Łukasik; J. Manfredi; A.B. McIntosh; P. Morfouace; T. Nakamura; N. Nakatsuka; S. Nishimura; R. Olsen; H. Otsu; P. Pawłowski; K. Pelczar; D. Rossi; H. Sakurai; C. Santamaria; H. Sato; H. Scheit; R. Shane; Y. Shimizu; H. Simon; A. Snoch; A. Sochocka; Z. Sosin; T. Sumikama; H. Suzuki; D. Suzuki; H. Takeda; S. Tangwancharoen; H. Toernqvist; Y. Togano; Z.G. Xiao; S.J. Yennello; J. Yurkon; Y. Zhang; Maria Colonna; Dan Cozma; Paweł Danielewicz; Hannah Elfner; Natsumi Ikeno; Che Ming Ko; Justin Mohs; Dmytro Oliinychenko; Akira Ono; Jun Su; Yong Jia Wang; Hermann Wolter; Jun Xu; Ying-Xun Zhang; Zhen Zhang
• Keywords: Multiplicity (mathematics)

In the past two decades, pions created in high density regions of heavy ion collisions have been predicted to be sensitive at densities symmetry energy term nuclear equation state, a property that is key our understanding neutron stars. new experiment designed study energy, multiplicities negatively and positively charged measured with accuracy for central 132Sn+124Sn, 112Sn+124Sn, 108Sn+112Sn E/A=270 MeV SπRIT Time Projection Chamber. While individual pion are 4% accuracy, those multiplicity ratios 2% accuracy. We compare these data predictions from seven major transport models. The calculations reproduce qualitatively dependence their on total proton number colliding systems. However, models different codes differ too much allow extraction reliable constraints data. This finding may explain previous contradictory conclusions obtained Au+Au system. These results call still better differences among codes, observables more energy.