Constraining nucleon effective masses with flow and stopping observables from the SπRIT experiment

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Author list: Tsang C.Y., Kurata-Nishimura M., Tsang M.B., Lynch W.G., Zhang Y.X., Barney J., Estee J., Jhang G., Wang R., Kaneko M., Lee J.W., Isobe T., Murakami T., Ahn D.S., Atar L., Aumann T., Baba H., Boretzky K., Brzychczyk J., Cerizza G., 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., Łukasik J., Manfredi J., McIntosh A.B., Morfouace P., Nakamura T., Nakatsuka N., Nishimura S., Otsu H., Pawłowski 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., Törnqvist H., Togano Y., Xiao Z.G., Yennello S.J., Zhang Y., SpiRIT collaboration

Publisher: Elsevier

Publication year: 2024

Journal: Physics Letters B (0370-2693)

Volume number: 853

ISSN: 0370-2693

eISSN: 1873-2445

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85191296621&doi=10.1016%2fj.physletb.2024.138661&partnerID=40&md5=98994488c7e101b27e5621cf635c621f

Languages: English-Great Britain (EN-GB)

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Abstract

Properties of the nuclear equation of state (EoS) can be probed by measuring the dynamical properties of nucleus-nucleus collisions. In this study, we present the directed flow (v1), elliptic flow (v2) and stopping (VarXZ) measured in fixed target Sn + Sn collisions at [Formula presented] with the SπRIT Time Projection Chamber. We perform Bayesian analyses in which EoS parameters are varied simultaneously within the Improved Quantum Molecular Dynamics-Skyrme (ImQMD-Sky) transport code to obtain a multivariate correlated constraint. The varied parameters include symmetry energy, S0, and slope of the symmetry energy, L, at saturation density, isoscalar effective mass, ms⁎/mN, isovector effective mass, mv⁎/mN and the in-medium cross-section enhancement factor η. We find that the flow and VarXZ observables are sensitive to the splitting of proton and neutron effective masses and the in-medium cross-section. Comparisons of ImQMD-Sky predictions to the SπRIT data suggest a narrow range of preferred values for ms⁎/mN, mv⁎/mN and η. © 2024 The Author(s)

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