Directed and elliptic flow observations in Sn+Sn collisions with radioactive beams at 270 MeV/u

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.

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Publication Details

Journal
Physics Letters B
Published
2025-10-25
DOI
https://doi.org/10.1016/j.physletb.2025.139970
Primary Topic
Nuclear reactor physics and engineering
Type
article
Field-Weighted Citation Impact
0.00

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article

Directed and elliptic flow observations in Sn+Sn collisions with radioactive beams at 270 MeV/u

S. Nishimura, Y. Zhang, G. Jhang, Natsumi Ikeno et al.
Physics Letters B
Nuclear reactor physics and engineering
article

Directed and elliptic flow observations in Sn+Sn collisions with radioactive beams at 270 MeV/u

S. Nishimura, Y. Zhang, G. Jhang, Natsumi Ikeno, T. Isobe, J. Barney, H. Törnqvist, T. Nakamura, Y.J. Kim, M. Kaneko, J. Brzychczyk, A. B. McIntosh, I. Gašparić, S. J. Yennello, W. G. Lynch, H. Simon, D. S. Ahn, T. Aumann, C. Santamaria, J. Łukasik, P. Pawłowski, M. B. Tsang, N. Chiga, Y. Leifels, K. Ieki, J. Estee, S. Tangwancharoen, A. Horvat, H. Baba, J. Manfredi, C. Y. Tsang, N. Inabe, L. Atar, H.S. Lee, Akira Ono, R. Wang, K. Boretzky, P. Lasko, H. Scheit, A. Sochocka, A. Snoch, M. Kurata-Nishimura, D. Rossi, Y. Kondo, H. Sakuraï, R. Shane, H. Otsu, Hiroaki Suzuki, K. Pelczar, P. Morfouace, Zhigang Xiao, D. Suzuki, H. Sato, N. Fukuda, H. Takeda, T. Sumikama, Y. Shimizu, T. Murakami, B. Hong, T. Kobayashi, G. Cerizza, Y. Togano, J.W. Lee, N. Nakatsuka
article en

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.

Physics Letters BVol. 871
National Science Foundation, U.S. Department of Energy, National Research Foundation, Ministry of Education, Culture, Sports, Science and Technology, National Research Foundation of Korea, Tsinghua University, Hrvatska Zaklada za Znanost, Forskningsrådet om Hälsa, Arbetsliv och Välfärd, Helmholtz International Center for FAIR, Japan Society for the Promotion of Science, RIKEN
Openalex Percentile: Top 58%
Nuclear reactor physics and engineering
DOIOpen Access PDFOpenAlex
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