Microscopic studies of production cross sections in multinucleon transfer reaction Ni-58 Sn-124
Microscopic studies of production cross sections in multinucleon transfer reaction Ni-58 Sn-124
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多核转移反应Ni-58 Sn-124生成截面的显微研究
DOI：
10.1103/physrevc.100.014612
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发表时间：
2019
影响因子：
3.1
通讯作者：
Guo Lu
中科院分区：
文献类型：
--
作者：
Wu Zhenji;Guo Lu
背景：低能碰撞下的多核子转移反应被认为有希望产生新的奇异核，这是很难通过其他方法产生的。理论研究需要为实验提供可靠的预测，并帮助理解在多核子转移反应的微观机制。目的：我们提供了一个预测的方法，生产截面和显示如何以及在何种程度上的微观方法在多核子转移反应工作。方法：我们采用的方法，它结合了微观时间依赖的Hartree-Fock（TDHF）模型与国家的最先进的统计模型，考虑到多核子转移动力学和二级去激发过程。利用粒子数投影方法，从TDHF动力学中提取了多核子转移过程中初级产物的性质，如转移几率和初级截面。结果：研究了靶核和射核的碰撞能量和形变取向对反应中多核子转移动力学的影响。观察到更多的核子转移在尖端碰撞比在侧碰撞。计算得到的次级碎片的产生截面与实验结果吻合得很好。在亚势垒能区，随着转移中子数的增加，理论计算结果逐渐偏离实验结果，表明TDHF方法中单一平均场近似的局限性.这种差异的可能起源进行了讨论。在所有的中子转移通道上积分的总截面与所有能量的实验数据吻合得很好。通过与GRAZING模型计算结果的比较发现，尽管微观TDHF方法中没有反应动力学的可调参数，但我们的方法给出了与半经典模型一样好的定量描述.结论：微观方法合理地再现了能量接近库仑势垒的实验数据，并很好地解释了多核子转移机制.目前的研究清楚地揭示了该方法在多核子转移反应中的适用性，从而为预测新反应的性质提供了一个有前途的工具。
Background:Multinucleon transfer reactions at low-energy collisions are considered to be promising for the production of new exotic nuclei, which are difficult to produce by other methods. Theoretical studies are required to provide reliable predictions for the experiments and to help understand the microscopic mechanism in multinucleon transfer reactions.Purpose:We provide a predictive approach for production cross sections and show how and to what extent the microscopic approach works well in multinucleon transfer reactions.Methods:We employ theapproach, which combines the microscopic time-dependent Hartree-Fock (TDHF) model with the state-of-art statistical model, to take into account both the multinucleon transfer dynamics and the secondary de-excitation process. The properties of primary products in multinucleon transfer process, such as transfer probabilities and primary cross sections, are extracted from TDHF dynamics using the particle-number projection method. Production cross sections for secondary products are evaluated using the statistical model.Results:We investigate the influence of colliding energies and deformation orientations of target and projectile nuclei on multinucleon transfer dynamics in the reaction. More nucleons are observed to transfer in the tip collision than in the side collision. The production cross sections for secondary fragments withcalculations well reproduce the experimental measurements at energies close to the Coulomb barrier. At sub-barrier energy, the theoretical results gradually deviate from the experimental data with the increase of the number of transferred neutrons, showing the limitations of a single mean-field approximation in the TDHF approach. Possible origins for this discrepancy are discussed. The total cross sections integrated over all the neutron transfer channels are in good agreement with the experimental data for all the energies. We compare the production cross sections ofcalculations with those from GRAZING model and find that our approach gives a description as quantitatively good as the semiclassical model, although there is no adjustable parameters for the reaction dynamics in the microscopic TDHF method.Conclusions:The microscopicapproach reasonably reproduces the experimental data at energies close to the Coulomb barrier and well accounts for the multinucleon transfer mechanism. The present studies clearly reveal the applicability ofmethod in multinucleon transfer reactions, which thus is a promising tool for predicting the properties of new reactions.