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Time-dependent generator-coordinate-method study of mass-asymmetric fission of actinides

机译：浮石质量不对称裂变的时间依赖发生器坐标方法研究

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摘要

Low-energy positive and negative parity collective states in the equilibrium minimum, and the dynamics of induced fission of actinide nuclei are investigated in a unified theoretical framework based on the generator coordinate method (GCM) with the Gaussian overlap approximation (GOA). The collective potential and inertia tensor, both at zero and finite temperature, are computed using the self-consistent multidimensionally constrained relativistic mean field model, based on the energy density functional DD-PC1. Pairing correlations are treated in the Bardeen-Cooper-Schrieffer approximation with a separable pairing force of finite range. A collective quadrupole-octupole Hamiltonian characterized by zero-temperature axially symmetric deformation energy surface and perturbative cranking inertia tensor, is used to model the low-lying excitation spectrum. The fission fragment charge distributions are obtained by propagating the initial collective states in time with the time-dependent GCM+GOA that uses the same quadrupole-octupole Hamiltonian, but with the collective potential and inertia tensor computed at finite temperature. The illustrative charge yields of Th-228, U-234, Pu-240, Cm-244, and Cf-250 are in very good agreement with experiment, and the predicted mass asymmetry is consistent with the result of a recent microscopic study that has attributed the distribution (peak) of the heavier-fragment nuclei to shell-stabilized octupole deformations.
机译：在基于发电机坐标法（GCM）的统一理论框架中，在高斯与高斯重叠近似（GOA）的统一理论框架中，在统一的理论框架中研究了低能量正和负奇偶阶段的集体状态。基于能量密度函数DD-PC1，使用自一致的多基线受限的相对论平均场模型来计算零和有限温度的集体电位和惯性张量。在Bardeen-Cocer-Schrieffer近似的配对相关性与有限范围的可分离配对力进行处理。通过零温度轴对称变形能表面和扰动旋转惯量张量的集体四极 - Octupole Hamiltonian用于模拟低位激励光谱。通过使用相同的四极ole-Octupole Hamiltonian的时间依赖的GCM + GOA传播初始集体状态来获得裂变片段电荷分布。 TH-228，U-234，PU-240，CM-244和CF-250的说明性充电产率与实验非常好，并且预测的质量不对称性与最近的显微镜研究的结果一致将较重的片段细胞核的分布（峰值）归因于壳稳定的octupole变形。

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  • 来源
    《Physical review, C》 |2019年第5期|共10页
  • 作者

    Zhao Jie; Xiang Jian; Li Zhi-Pan; Niksic Tamara; Vretenar Dario; Zhou Shan-Gui;

  • 作者单位

    China Acad Engn Phys Microsyst &

    Terahertz Res Ctr Chengdu 610200 Sichuan Peoples R China;

    Qiannan Normal Univ Nationalities Dept Phys &

    Elect Sci Duyun 558000 Peoples R China;

    Southwest Univ Sch Phys Sci &

    Technol Chongqing 400715 Peoples R China;

    Univ Zagreb Fac Sci Phys Dept Bijenicka Cesta 32 Zagreb 10000 Croatia;

    Univ Zagreb Fac Sci Phys Dept Bijenicka Cesta 32 Zagreb 10000 Croatia;

    Chinese Acad Sci Inst Theoret Phys CAS Key Lab Theoret Phys Beijing 100190 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 原子核物理学、高能物理学;
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