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Detail study of application of the relativistic mean-field effective NN forces for heavy-ion fusion within a dynamical model
Journal of Physics G: Nuclear and Particle Physics ( IF 3.5 ) Pub Date : 2020-11-19 , DOI: 10.1088/1361-6471/ab907a
M V Chushnyakova 1 , I I Gontchar 2 , N A Khmyrova 2
Affiliation  

In the analysis of the heavy-ion above-barrier fusion cross-sections of complex nuclei, the relativistic effects are usually ignored. In the present work, we undertake a step toward accounting for these effects. Namely, the nucleus–nucleus interaction potential is obtained using the double-folding model with six different effective nucleon–nucleon (NN) forces coming from the relativistic mean field (RMF) theory. We also compare our present results with the ones obtained with the non-relativistic M3Y NN-forces. In all calculations, the nuclear densities resulting from the Hartree–Fock approach with the SKX-Skyrme forces accounting for the tensor part are used. Our calculations show that four sets of the considered RMF forces cannot be used for describing heavy ion fusion. Of the remaining two sets, one results in the barriers which are too high not leaving any room for the dissipative effects. Only the potentials calculated using the NL2 NN-forces allow us to reproduce the experimental cross-sections within the framework of the fluctuation–dissipation trajectory model with surface friction with a typical accuracy of 3%–5%. The values of the variable parameter of the model which defines the friction strength resulting from the present calculations are systematically lower than those obtained earlier with the M3Y NN-forces.



中文翻译:

相对论平均场有效NN力在动力学模型中对重离子融合的应用的详细研究

在分析复杂原子核的重离子以上势垒融合截面时,相对论效应通常被忽略。在目前的工作中,我们朝着解释这些影响迈出了一步。即,利用相对论平均场(RMF)理论的六种不同有效核子-核子(NN)力,使用双折叠模型获得了核-核相互作用的潜力。我们还将当前结果与通过非相对论M3Y NN力获得的结果进行比较。在所有计算中,均使用了由Hartree-Fock方法得出的核密度,其中SKX-Skyrme力占张量部分。我们的计算表明,四组考虑的RMF力不能用于描述重离子聚变。在剩下的两套中 一个导致的障碍是太高了,没有留下任何消散作用的空间。只有使用NL2 NN力计算出的电势,我们才能在具有表面摩擦的起伏耗散轨迹模型的框架内再现实验横截面,其典型精度为3%–5%。该模型的可变参数的值(定义为通过当前计算得出的摩擦强度)在系统上低于先前使用M3Y NN力获得的值。

更新日期:2020-11-19
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