(SπRIT Collaboration) Kurata-Nishimura, M.; Kaneko, M.; Isobe, T.; Murakami, T.; Ono, A.; Ikeno, N.; Tsang, C.Y.; Barney, J.; Estee, J.; Jhang, G.; Lee, J.W.; Lynch, W.G.; Tsang, M.B.; Shane, R.; Santamaria, C.; Tangwancharoen, S.; Wang, R.; McIntosh, A.B.; Yennello, S.J.; Cerizza, G.; Manfredi, J.; Morfouace, P.; Lasko, P.; Łukasik, J.; Sochocka, A.; Kim, Y.J.; Pawłowski, P.; Pelczar, K.; Brzychczyk, J.; Zhang, Y.; Hong, B.; Xiao, Z.G.; Atar, L.; Aumann, T.; Boretzky, K.; Gašparić, Igor; Horvat, Andrea; Leifels, Y.; Rossi, D.; Scheit, H.; Simon, H.; Snoch, A.; Törnqvist, H.; Ahn, D.S.; Baba, H.; Chiga, N.; Fukuda, N.; Ieki, K.; Inabe, N.; Kobayashi, T.; Kondo, Y.; Lee, H.S.; Nakamura, T.; Nakatsuka, N.; Nishimura, S.; Otsu, H.; Sakurai, H.; Sato, H.; Shimizu, Y.; Sumikama, T.; Suzuki, D.; Suzuki, H.; Takeda, H.; Togano, Y. (2025) Directed and elliptic flow observations in Sn+Sn collisions with radioactive beams at 270 MeV/u. Physics Letters B, 871 . ISSN 1873-2445
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Abstract
Radioactive tin beams were used to explore the flow observables under varying isospin asymmetries while maintaining a constant total charge. The rapidity dependence of directed flow (v1) and elliptic flow (v2) was studied for protons, deuterons, tritons, 3He, and 4He, produced in neutron-rich 132Sn + 124Sn and neutron-deficient 108Sn + 112Sn collisions at 270 MeV∕nucleon. In general, heavier particles exhibited larger v1 and v2 values. The experimental data was used to test transport models which simulate heavy ion collisions. Specifically, comparisons were made with Antisymmetrized Molecular Dynamics (AMD) model calculations, which explicitly account for cluster correlations. Two types of momentum-dependent mean field potentials were tested. The results reveal that both v1 and v2 values are enhanced when the mean field incorporates stronger momentum dependence. In addition, v2 exhibits larger sensitivity to symmetry energy than v1 but the overall sensitivity to symmetry energy is low. In an attempt to describe the data, different parameter sets have been tried. Most describe either the hydrogen flow or helium flow reasonably well but none describes the flow of all particles simultaneously.
| Item Type: | Article | ||||||||||||
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| Uncontrolled Keywords: | Collective flow; Radioactive heavy ion collision; Isospin symmetry energy; Momentum dependent mean field potential | ||||||||||||
| Subjects: | NATURAL SCIENCES > Physics > Nuclear Physics | ||||||||||||
| Divisions: | Division of Experimental Physics | ||||||||||||
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| Depositing User: | Lorena Palameta | ||||||||||||
| Date Deposited: | 04 Mar 2026 14:00 | ||||||||||||
| URI: | http://fulir.irb.hr/id/eprint/11317 | ||||||||||||
| DOI: | 10.1016/j.physletb.2025.139970 |
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