Particle transfer and fusion cross-section for super-heavy nuclei in dinuclear system

Particle transfer and fusion cross-section for super-heavy nuclei in dinuclear system
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双核系统中超重核的粒子转移和聚变截面

DOI:
10.1088/0954-3899/32/8/006
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发表时间:
2005-09
影响因子:
3.5
通讯作者:
Jia, Fei
Jia, Fei
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Wang, Nan;Zhao, Enguang;Scheid, W.;Li, Junqing;Zuo, Wei;Li, Qingfeng;Xu, Hushan;Li, Wenfei;Jia, Fei

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在双核体系(DNS)的概念中,不需要解析求解Fokker-Planck方程(FPE),而是通过数值求解主方程来计算超重核的聚变几率,从而避免了对DNS势能的谐振子近似。 明确描述了包含能量、角动量和碎片形变弛豫的相对运动,并与核子扩散过程相耦合。核子跃迁几率是从微观上导出的,它与相对运动的能量耗散有关。因此,它们是时间相关的。与平衡态FPE的解析解相比,我们的含时结果保留了更多的动力学效应.计算得到的铅基反应单中子发射通道的蒸发残渣截面与已知的实验数据在一个数量级内基本一致。
Within the dinuclear system (DNS) conception, instead of solving the Fokker-Planck equation (FPE) analytically, the master equation is solved numerically to calculate the fusion probability of super-heavy nuclei, so that the harmonic oscillator approximation to the potential energy of the DNS is avoided. The relative motion concerning the energy, the angular momentum and the fragment deformation relaxations is explicitly treated to couple with the diffusion process. The nucleon transition probabilities, which are derived microscopically, are related with the energy dissipation of the relative motion. Thus they are time dependent. Comparing with the analytical solution of FPE at the equilibrium, our time-dependent results preserve more dynamical effects. The calculated evaporation residue cross-sections for one-neutron emission channel of Pb-based reactions are basically in agreement with the known experimental data within one order of magnitude.
DOI: 10.1209/epl/i2003-00622-0
发表时间: 2003-12
期刊: EPL
影响因子: 1.8
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Wenfei Li;N. Wang;J. F. Li;H. Xu;W. Zuo;E. Zhao;Jie Li;W. Scheid
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影响因子: 18.1
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