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Study of Pauli blocking methods in transport models

Xiang Chen (陈响)

School of Physics, Henan Normal University

*China Institute of Atomic Energy

August 21-25, Taiyuan, China

The 8th International Workshop on Nuclear Dynamics in Heavy-ion Reactions(IWND2026),

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  • Introduction: What is the Pauli blocking, and why is it studied?

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  • A novel Pauli blocking method considering the quantum effect

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  • Conclusion and Outlook

Outline

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  • Introduction: What is the Pauli blocking, and why is it studied?

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  • A novel Pauli blocking method considering the quantum effect

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  • Conclusion and Outlook

Outline

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Definition of the Pauli blocking

 

 

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TMEP collab., PRC 97, 034625 (2018)

Challenge: Underestimation of Pauli Blocking

23-40 c/fm

~3.5 c/fm

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Testing different Pauli blocking methods in nuclear matter

X. Chen, Y.X. Zhang, Z.X. Li, CPC 45, 074109 (2021)

Pauli blocking will affect the constraint of the in-medium nucleon-nucleon scattering cross-section(NNSCS), so it is necessary to develop an advanced Pauli blocking method!

Challenge: Underestimation of Pauli Blocking

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  • Introduction: What is the Pauli blocking, and why is it studied?

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  • A novel Pauli blocking method considering the quantum effect

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  • Conclusion and Outlook

Outline

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PB(W*)

PB(W)

X. Chen, J.P. Yang, Y. Cui, K. Zhao, Z.X. Li, Y.X. Zhang, PRC 109, L021604 (2024)

 

 

 

Considering the quantum effect

 

 

A novel Pauli blocking method considering the quantum effect

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  • Fluctuation of the occupation probability: largely reduced；

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  • Average occupation probability: more close to the benchmark value；

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  • closest to the benchmark value in the known QMD models when no new parameters are introduced.
  • Testing new Pauli blocking method in nuclear matter

X. Chen, J.P. Yang, Y. Cui, K. Zhao, Z.X. Li, Y.X. Zhang, PRC 109, L021604 (2024)

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  • Fluctuation of occupation probability: largely reduced；

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  • Spurious collisions in the surface region of the nucleus: largely suppressed；

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  • better stability.

X. Chen, J.P. Yang, Y. Cui, K. Zhao, Z.X. Li, Y.X. Zhang, PRC 109, L021604 (2024)

  • Testing new Pauli blocking method in finite nucleus

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  • The influence of the new Pauli blocking on the in-medium NNSCS

X. Chen, J.P. Yang, Y. Cui, K. Zhao, Z.X. Li, Y.X. Zhang, PRC 109, L021604 (2024)

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preliminary

  • The influence of the new Pauli blocking on the in-medium NNSCS

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  • Introduction: What is the Pauli blocking, and why is it studied?

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  • A novel Pauli blocking method considering quantum effects

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  • Conclusion and Outlook

Outline

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  • Proposing a novel Pauli blocking method considering the quantum effect, and it is currently the best Pauli blocking method in the QMD-type models.

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  • With the new Pauli blocking, the in-medium NNSCS will be extracted by analyzing the experimental data of flow and stopping power in heavy-ion collisions.

Conclusion and Outlook

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Acknowledgements

Collaborators：

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CIAE: Ying-Xun Zhang, Jun-Ping Yang, Li Li, Xin-Yu Wang, Ying Cui, Kai Zhao, Zhu-Xia Li

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Thank you for your attention！

E-mail: chenxiangitnp@163.com; chenxiang@htu.edu.cn