Non-Gaussian Fluctuations and Non-Markovian Effects in the Nuclear Fusion Process: Langevin Dynamics Emerging from Quantum Molecular Dynamics Simulations

Kai Wen (温凯), Fumihiko Sakata (坂田文彦), Zhu-Xia Li (李祝霞), Xi-Zhen Wu (吴锡真), Ying-Xun Zhang (张英逊), and Shan-Gui Zhou (周善贵)
Phys. Rev. Lett. 111, 012501 – Published 2 July 2013

Abstract

Macroscopic parameters as well as precise information on the random force characterizing the Langevin-type description of the nuclear fusion process around the Coulomb barrier are extracted from the microscopic dynamics of individual nucleons by exploiting the numerical simulation of the improved quantum molecular dynamics. It turns out that the dissipation dynamics of the relative motion between two fusing nuclei is caused by a non-Gaussian distribution of the random force. We find that the friction coefficient as well as the time correlation function of the random force takes particularly large values in a region a little bit inside of the Coulomb barrier. A clear non-Markovian effect is observed in the time correlation function of the random force. It is further shown that an emergent dynamics of the fusion process can be described by the generalized Langevin equation with memory effects by appropriately incorporating the microscopic information of individual nucleons through the random force and its time correlation function.

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  • Received 30 April 2013

DOI:https://doi.org/10.1103/PhysRevLett.111.012501

© 2013 American Physical Society

Authors & Affiliations

Kai Wen (温凯)1, Fumihiko Sakata (坂田文彦)2,1, Zhu-Xia Li (李祝霞)3, Xi-Zhen Wu (吴锡真)3, Ying-Xun Zhang (张英逊)3, and Shan-Gui Zhou (周善贵)1,4,*

  • 1State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 2Institute of Applied Beam Science, Graduate School of Science and Technology, Ibaraki University, Mito 310-8512, Japan
  • 3China Institute of Atomic Energy, Beijing 102413, China
  • 4Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China

  • *sgzhou@itp.ac.cn

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Vol. 111, Iss. 1 — 5 July 2013

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