多核子转移反应中产生N=126丰中子同中子异位素的最佳探测角度

Advantages of the multinucleon transfer reactions based on 238U target for producing neutron-rich isotopes around N = 126

The mechanism of multinucleon transfer (MNT) reactions for producing neutron-rich heavy nuclei around N = 126 is investigated within two different theoretical frameworks: dinuclear system (DNS) model and isospin-dependent quantum molecular dynamics (IQMD) model. The effects of mass asymmetry relaxation, N=Z equilibration, and shell closures on production cross sections of neutron-rich heavy nuclei are investigated. For the first time, the advantages for producing neutron-rich heavy nuclei around N = 126 is found in MNT reactions based on 238U target. We propose the reactions with 238U target f…

深入认识多核子转移反应中电荷平衡过程及其对N=126附近丰中子同位素产生的影响

Deep insight into charge equilibration and the effects on producing neutron-rich isotopes around N = 126 in the multinucleon transfer reactions

本文利用DNS-sysu和ImQMD模型研究多核子转移反应中的电荷平衡机制，发现质量不对称体系存在不完全电荷平衡和逆电荷平衡现象，并澄清了电荷平衡与质量不对称性的关联，为产生N=126附近丰中子同位素提供依据。

Production of new neutron-rich heavy nuclei with $Z=56-80$ in the multinucleon transfer reactions of $^{136}$Xe+$^{198}$Pt

The multinucleon transfer reactions in collisions of $^{136}$Xe+$^{198}$Pt at incident energies $E_{\textrm{lab}}=$5.25, 6.20, 7.98, 10.0, and 15.0 MeV/nucleon are investigated by using the improved quantum molecular dynamics model. It is found that 6.20 MeV/nucleon is the optimal incident energy for producing the neutron-rich heavy nuclei. About 80 unknown neutron-rich nuclei might be produced in this reaction with cross sections from 10$^{-6}$ to 10$^{-2}$ mb. The angular distributions of the neutron-rich isotopes are predicted.

Selection of projectiles for producing trans-uranium nuclei in transfer reactions within an improved dinuclear system model

The multinucleon transfer process is one promising approach for producing neutron-rich heavy nuclei. The favorable projectile-target combinations play a key role in experiments. As one important approach to investigate the multinucleon transfer process, one new version of the dinuclear system (DNS) model is developed. The improved version of the DNS model is shown in detail. Based on deformation degree of freedom in the improved DNS model, one way of calculating excitation energies of primary fragments is proposed. And the remarkable improvements for describing experimental data of producing t…

多核子转移反应中团簇转移对N=126附近丰中子核素产生的影响

Effect of cluster transfer on neutron-rich nuclide production around N=126 in multinucleon transfer reactions

本文将团簇转移引入双核系统模型主方程，研究多核子转移反应中N=126附近丰中子重核的产生机制，成功复现实验数据并预测了新的丰中子同位素截面，为未来实验提供依据。

Enhanced nucleon transfer in tip collisions of $^{238}$U+$^{124}$Sn

Multinucleon transfer processes in low-energy heavy ion reactions have attracted increasing interest in recent years aiming at 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) Experimental…