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Enhanced nucleon transfer in tip collisions of ~(238)U+~(124)Sn

机译：增强的核心转移〜（238）u +〜（124）sn

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摘要

Multinucleon transfer processes in low-energy heavy ion reactions have attracted increasing interest in recent years aiming at the production of new neutron-rich isotopes. Clearly, it is an imperative task to further develop understanding of underlying reaction mechanisms to lead experiments to success. In this paper, from systematic time-dependent Hartree-Fock calculations for the ~(238)U+~(124)Sn reaction, it is demonstrated that transfer dynamics depend strongly on the orientations of ~(238)U, quantum shells, and collision energies. Two important conclusions are obtained: (i) Experimentally observed many-proton transfer from ~(238)U to ~(124)Sn can be explained by a multinucleon transfer mechanism governed by enhanced neck evolution in tip collisions; (ii) novel reaction dynamics are observed in tip collisions at energies substantially above the Coulomb barrier, where a number of nucleons are transferred from ~(124)Sn to ~(238)U, producing transuranium nuclei as primary reaction products, which could be a means to synthesize superheavy nuclei. Both results indicate the importance of the neck (shape) evolution dynamics, which are sensitive to orientations, shell effects, and collision energies, for exploring possible pathways to produce new unstable nuclei.
机译：近年来，低能量重离子反应中的多核转移过程引起了较令人兴趣的兴趣，旨在致力于生产新的中子的同位素。显然，它是一个必要的任务，以进一步了解对潜在的反应机制来赋予成功的实验。在本文中，从系统时间依赖的Hartree-Fock计算的〜（238）U +〜（124）Sn反应，证明转移动力学强烈依赖于〜（238）U，量子壳和碰撞的方向上能量。获得了两个重要的结论：（i）通过通过提高尖碰撞的颈部演变治理，通过增强颈部演化治理的多核传递机制来解释来自〜（238）U至〜（124）Sn的许多质子转移; （ii）在基本上高于库仑屏障上方的能量的尖端碰撞中观察到新的反应动力学，其中许多核聚物从〜（124）Sn转移到〜（238）U中，产生过铀核作为初级反应产物，这可能是一种合成过度核的手段。这两种结果都表明颈部（形状）演化动力学的重要性，这些动态对取向，壳体效应和碰撞能量敏感，以探索产生新的不稳定核的可能途径。

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