Symmetry energy investigation with pion production from Sn+Sn systems

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.; Gašparić, I.; Hong, B.; Horvat, A.; Ieki, K.; Inabe, N.; Kim, Y.J.; Kobayashi, Toshio; Kondo, Y.; Lasko, P.; Lee, H.S.; Leifels, Y.; Łukasik, J.; Manfredi, J.; McIntosh, A. B.; Morfouace, P.; Nakamura, Takashi; Nakatsuka, N.; Nishimura, S.; Olsen, Richard W.; Otsu, H.; Pawłowski, P.; Pelczar, K.; Rossi, D.; Sakuraï, H.; Santamaria, C.; Sato, Hiromi; Scheit, H.; Shane, R.; Shimizu, Y.; Simon, H.; Snoch, A.; Sochocka, A.; Sosin, Z.; Sumikama, T.; Suzuki, Hiroshi; Suzuki, D.; Takeda, Hiroyuki; Tangwancharoen, S.; Toernqvist, H.; Togano, Y.; Zhang, Xiao; Yennello, S. J.; Yurkon, J.; Zhang, Y.; Colonna, M.; Cozma, Dan; Danielewicz, Paweł; Elfner, Hannah; Ikeno, Natsumi; Ko, Che Ming; Mohs, Justin; Oliinychenko, Dmytro; Ono, Akira; Su, Jun; Wang, Yongjia; Wolter, H.H.; Xu, Jing; Zhang, Yingxun; Zhang, Zhen

doi:10.1016/j.physletb.2020.136016

Cited by 52 publications

(37 citation statements)

References 50 publications

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“…Multiple transport simulations have been carried out in the context of 270 MeV/nucl Sn + Sn experiments performed recently at RIKEN [17]. In Fig.…”

Section: B Why 3d Characteristics?mentioning

confidence: 99%

Deblurring for Nuclei: 3D Characteristics of Heavy-Ion Collisions

Danielewicz,

Kurata-Nishimura

2021

Preprint

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Deblurring procedure is proposed for accessing three-dimensional (3D) differential distributions relative to the reaction plane in energetic high-multiplicity heavy-ion collisions. Because reaction plane direction can be only coarsely estimated in measurements for the collisions, any direct attempts to measure 3D characteristics will yield blurred results. However, it is not difficult to estimate the distribution of the estimated reaction plane direction around the true. Once that blurring function is known, a deblurring procedure can be applied to reveal underlying characteristics of the emission relative to the true reaction plane. This is similar to image restoration in optics, such as from an image recorded with a shaken camera.

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“…Multiple transport simulations have been carried out in the context of 270 MeV/nucl Sn + Sn experiments performed recently at RIKEN [17]. In Fig.…”

Section: B Why 3d Characteristics?mentioning

confidence: 99%

Deblurring for Nuclei: 3D Characteristics of Heavy-Ion Collisions

Danielewicz,

Kurata-Nishimura

2021

Preprint

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“…This model has provided constraints on the symmetry energy from neutron and proton elliptic flow measurements [21] and from pion production [27,43]. It also provides reasonable predictions of the pion multiplicities and ratios for the current experiment [42]. A unique aspect of the dcQMD model is the implementation of the conservation of total energy for the system, which is not simply satisfied at the two-body level due to the momentum and isospin asymmetry dependence of interactions.…”

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confidence: 94%

“…Such sensitivities to the details in pion and Δ potentials for the low energy pions could account for the differences in transport code predictions for the total pion yields reported in Ref. [42].…”

mentioning

confidence: 96%

“…The total 𝜋 − and 𝜋 + multiplicities and their ratios for central (𝑏 ≈ 3 fm) 132 Sn + 124 Sn, 112 Sn + 124 Sn, 108 Sn + 112 Sn collisions are published in Ref. [42]. Comparisons of the total pion ratios predicted by seven different theoretical calculations exhibit differences among them that exceed their sensitivity to the symmetry energy.…”

mentioning

confidence: 99%

“…[43,51]. We find that the usual Ansatz of setting the Δ potential in nuclear matter equal to that of nucleons leads to incorrect 𝜋 − and 𝜋 + production thresholds and total multiplicities [28,42]. Therefore, we adjust the potential depths at saturation density and effective masses in the iso-scalar and iso-vector channels [28] of the Δ to reproduce experimental total pion multiplicities and mean kinetic energies.…”

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confidence: 99%

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Probing the Symmetry Energy with the Spectral Pion Ratio

Estee,

Lynch,

Tsang

et al. 2021

Preprint

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Many neutron star (NS) properties, such as the proton fraction within a NS, reflect the symmetry energy contributions to the Equation of State that dominate when neutron and proton densities differ strongly. To constrain these contributions at supra-saturation 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 208 Pb.

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Hadrons, Quark-Gluon Plasma, and Neutron Stars

Ohnishi

2022

Handbook of Nuclear Physics

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Symmetry energy investigation with pion production from Sn+Sn systems

Cited by 52 publications

References 50 publications

Deblurring for Nuclei: 3D Characteristics of Heavy-Ion Collisions

Deblurring for Nuclei: 3D Characteristics of Heavy-Ion Collisions

Probing the Symmetry Energy with the Spectral Pion Ratio

Hadrons, Quark-Gluon Plasma, and Neutron Stars

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