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arXiv 2312.04568nucl-th
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$^{187}$Ir裂变的多模态性:基于Langevin方法的研究

Multimodality of $^{187}$Ir fission studied by Langevin approach

Y. G. Huang, F. C. Gu, Y. J. Feng, H. Wang, E. X. Xiao, X. Lei, L. Zhu, J. Su

AI总结:

利用三维Langevin方法研究$^{187}$Ir裂变,识别出四种裂变模式,发现单峰质量分布下隐藏多模态性,并揭示质子与中子壳效应的竞争。

摘要:

[背景] 亚铅核素的裂变机制仍不清楚,尤其是所涉及的裂变模式类型及其相应的壳效应。[目的] 旨在识别$^{187}$Ir裂变中的不同模式,并研究其相应机制。[方法] 采用考虑核伸长、形变和质量不对称性的三维Langevin方法模拟裂变动动力学。使用宏观-微观模型计算输运系数。[结果] 计算了不同激发能下$^{187}$Ir裂变的碎片质量、形变和总动能(TKE)。基于质量-TKE关联,识别出四种裂变模式,即两种不对称标准模式、一种对称超长模式和一种对称液滴模式。发现两种不对称模式具有很强的激发能抗性。质量分布显示出单峰形状的主导地位,与实验数据吻合良好。分析了裂变势能面和裂变动动力学,以探究各模式的起源以及中子与质子壳效应之间的竞争。[结论] $^{187}$Ir裂变在可观测量的单峰状分布背后包含了多种裂变模式。具有不同不对称参数的质子和中子幻数可能增强对壳修正不确定性的敏感性。

英文摘要:

[Background] The fission mechanism of sub-lead nuclides remains unclear, especially the types of fission modes involved and their corresponding shell effects. [Purpose] The aim is to identify the different modes in the fission of $^{187}$Ir, and investigate the corresponding mechanism. [Method] The three-dimensional Langevin approach considering nucleus elongation, deformation, and mass asymmetry is applied to simulate fission dynamics. The macro-microscopic models are used to calculate the transport coefficients. [Results] The fragment mass, deformation, and total kinetic energy (TKE) of $^{187}$Ir fission at different excitation energies are calculated. Based on the mass-TKE correlations, four fission modes are identified, namely two asymmetric standard modes, a symmetric super-long mode, and a symmetric liquid-drop mode. Strong excitation-energy resistance of two asymmetric modes is found. The mass distributions show the dominance of single-peak shape, which is in good agreement with experimental data. The fission potential energy surface and the fission dynamics are analyzed to investigate the origins of the modes and the competition between neutron and proton shell effects. [Conclusions] Multiple fission modes are included in the $^{187}$Ir fission behind the single-peak-like distribution of observables. The proton and neutron magic numbers with different asymmetry parameter might heighten the sensitivity to the uncertainties of shell corrections.

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