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首页> 外文会议>AIP Conference Proceedings vol.865; China-Japan Joint Nuclear Physics Symposium; 20060516-20; Shanghai(CN) >A Microscopic Transport Model for Synthesis of Superheavy Nuclei
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A Microscopic Transport Model for Synthesis of Superheavy Nuclei

机译：合成超重核的微观传输模型

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摘要

Isospin dependent molecular dynamics model has been used successfully for studying isospin effects of heavy ion collisions at intermediate energies. However, there are problems with this model for studying nuclear fusion at low energies near Coulomb barrier, such as unphysical nucleon emissions in the process of projectile and target approaching, lack of shell effect, etc. We improve the isospin dependent molecular dynamics model from various aspects for studying the dynamical process for synthesis of superheavy nuclei at low energies. The shell correction energy of the system is calculated by using deformed two-center shell model. The surface energy of the system is improved by introducing a switch function that combines the surface energies of projectile and target with the one of the compound nucleus. For reaction systems induced by of ~(16)O and ~(40,48)C at low energies near Coulomb barrier, it is found that the calculated fusion cross sections show a strong enhancement for the neutron-rich combinations, which can regenerate the experimental data quantitatively. For heavy systems such as ~(48)Ca+~(208)Pb and ~(48)Ca+~(238)U, preliminary calculations show that the experimental capture cross sections can be reproduced quanlitively. This model could pave a way for realistic predication of cross sections for synthesis of superhavey nuclei for different projectile-target systems at low energies near Coulomb barrier in future experiments.
机译：依赖于同位旋的分子动力学模型已成功用于研究中等能量下重离子碰撞的同位旋效应。但是，此模型用于研究在库仑势垒附近的低能量时的核聚变存在一些问题，例如弹丸和目标逼近过程中的非物理核子发射，缺乏壳效应等。我们从各种角度改进了与同旋异构体有关的分子动力学模型研究低能合成超重核的动力学过程。利用变形的双中心壳模型计算系统的壳修正能。通过引入开关功能，将弹丸和目标的表面能与复合核之一相结合，可以改善系统的表面能。对于由〜（16）O和〜（40,48）C在库仑势垒附近的低能量下诱导的反应系统，发现计算得出的聚变截面对富中子的组合显示出强烈的增强作用，从而可以再生量化实验数据。对于重型系统，例如〜（48）Ca +〜（208）Pb和〜（48）Ca +〜（238）U，初步计算表明，实验俘获截面可以定量地再现。该模型可以为将来在未来实验中在库仑势垒附近低能下不同弹丸-目标系统合成超级哈维核的实际截面铺平道路。

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