arXiv 0901.04702009-01-05nucl-th

从双核到单核--大质量系统聚变中的颈演化

From Di-Nucleus to Mono-Nucleus - Neck Evolution in Fusion of Massive Systems -

Y. Abe, C. Shen, D. Boilley, B. G. Giraud

备注：: 6 pages, 3 figures, Proceedings of the Japanese French Symposium - New paradigms in Nuclear Physics, Paris, 29th September - 2nd October, to be published in Int. J. of Modern Physics E
发表信息：: Japanese French Symposium - New paradigms in Nuclear Physics, Paris, Paris : France (2008)

摘要：

研究了重离子聚变过程中颈部自由度的动力学问题。时间尺度的三个自由度（相对距离，颈部和质量不对称）的研究，显示了早期平衡的颈部。这意味着由离子的入射组合形成的双核在聚变过程中快速形成具有超变形的单核，并且必须以耦合方式求解其他两个自由度。简要介绍了朗之万方法和耗散涨落动力学及其在超重元素合成中的应用。

英文摘要：

Dynamics of the neck degree of freedom during fusioning process between heavy ions is studied. Time scales of the three degrees of freedom (the relative distance, the neck and the mass-asymmetry) are studied, showing an early equilibration of the neck. This means that a di-nucleus formed by the incident combination of ions quickly forms a mono-nucleus with a superdeformation during the fusion process and that the other two degrees of freedom have to be solved in a coupled way. A brief introduction of Langevin approach and dissipation-fluctuation dynamics is also given and of the application to the synthesis of the superheavy elements.

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