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Symmetry energy investigation with pion production from Sn+Sn systems

(SRIT Collaboration ; TMEP Collaboration) Jhang, G.; Estee, J.; Barney, J.; Cerizza, G.; Kaneko, M.; Lee, J. W.; Lynch, W. G.; Isobe, T.; Kurata-Nishimura, M.; Murakami, T.; Tsang, C. Y.; Tsang, M. B.; Wang, R.; Ahn, D. S.; Atar, L.; Aumann, T.; Baba, H.; Boretzky, K.; Brzychczyk, J.; Chiga, N.; Fukuda, N.; Gasparic, I; Hong, 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.; Olsen, R.; 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.; Sosin, Z.; Sumikama, T.; Suzuki, H.; Suzuki, D.; Takeda, H.; Tangwancharoen, S.; Toernqvist, H.; Togano, Y.; Xiao, Z. G.; Yennello, S. J.; Yurkon, J.; Zhang, Y.; Colonna, Maria; Cozma, Dan; Danielewicz, Pawel; Elfner, Hannah; Ikeno, Natsumi; Ko, Che Ming; Mohs, Justin; Oliinychenko, Dmytro; Ono, Akira; Su, Jun; Wang, Yong Jia; Wolter, Hermann; Xu, Jun; Zhang, Ying-Xun; Zhang, Zhen (2021) Symmetry energy investigation with pion production from Sn+Sn systems. Physics letters. B, 813 . ISSN 0370-2693

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

Item Type: Article
Uncontrolled Keywords: nuclear equation of state ; symmetry energy ; heavy-ion collisions ; pion production
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Experimental Physics
Project titleProject leaderProject codeProject type
Zemljovid atomskih jezgara - neutronski bogata stranaSzilner, SuzanaIP-2018-01-1257HRZZ
Nuklearna struktura i reakcije: eksperimentima prema neutronskoj liniji kapanjaSzilner, SuzanaIP-2013-11-7194HRZZ
Depositing User: Igor Gašparić
Date Deposited: 16 Mar 2021 09:28
DOI: 10.1016/j.physletb.2020.136016

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