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2025-04-03 (Czwartek)
Zapraszamy do sali 1.01, ul. Pasteura 5 o godzinie 10:15 
dr Yannen Jaganathen (NCBJ)Demystifying the Fusion Mechanism in Heavy-Ion Collisions: A Six-Dimensional Langevin Dissipative Dynamics Approach
In this seminar, I will present a comprehensive investigation of heavy-ion fusion dynamics using a six-dimensional Langevin framework that allows for the unrestricted motion of the asymmetry parameter. This stochastic approach naturally incorporates dissipation, friction, and energy fluctuations, providing a detailed description of the fusion process. The dynamics enter the overdamped regime, leading to rapid neck stabilization, while capturing the intricate coupling between shape and rotational degrees of freedom.
As an initial study, we make use of simple potentials (Yukawa-plus-exponential folding + Coulomb) and Gaussian random forces. Still, by incorporating friction, mass tensor parameters and diffusion strength, our analysis offers a general understanding of the process. The approach achieves excellent agreement with experimental spin distributions for the 64Ni + 92,96Zr systems at a 50 MeV excitation energy, laying a strong foundation for future studies on the synthesis of superheavy elements and the exploration of the enigmatic fusion hindrance mechanism. Our ultimate goal is the inclusion of shell effects in the potential surface to provide a fully microscopic-macroscopic description of the dissipative process.
As an initial study, we make use of simple potentials (Yukawa-plus-exponential folding + Coulomb) and Gaussian random forces. Still, by incorporating friction, mass tensor parameters and diffusion strength, our analysis offers a general understanding of the process. The approach achieves excellent agreement with experimental spin distributions for the 64Ni + 92,96Zr systems at a 50 MeV excitation energy, laying a strong foundation for future studies on the synthesis of superheavy elements and the exploration of the enigmatic fusion hindrance mechanism. Our ultimate goal is the inclusion of shell effects in the potential surface to provide a fully microscopic-macroscopic description of the dissipative process.