Subjects: Nuclear Science and Technology >> Nuclear Science and Technology submitted time 2025-06-24
Abstract： We studied the energy partition between two well-separated fission fragments associated with the partition of nucleons owing to quantum entanglement. This is different from most fission models that invoke an explicit statistical partition of excitation energies. The dynamical fission evolution is described within the timedependent Hartree-Fock+BCS framework. Excitation energies of isotopic fission fragments were obtained using the particle-number projection method after the dynamical splitting of 238U. The resulting excitation energies of the light and heavy fragments are consistent with the appearance of sawtooth structures. We found that the pairing correlation strengths have a significant influence on the partition of the excitation energies. Furthermore, the excitation energies of isotopic fragments increase with increasing neutron number, implying the suppression of the production of neutron-rich beams in rare-isotope beam facilities.
Peer Review Status:
Awaiting Review
Subjects: Physics >> Nuclear Physics submitted time 2023-10-07
Abstract： This article presents a comprehensive study on the fission process in Th, U, Pu, and Cm isotopes using a Yukawa-folded mean-field plus standard pairing model. The focus is on analyzing the effects of the pairing interaction on the fragment mass distribution and its dependence on nuclear elongation. The study demonstrates that the pairing interaction plays an important role in the fragment mass distribution for $^{230}$Th, $^{234}$U, $^{240}$Pu, and $^{246}$Cm. Numerical analysis reveals that increasing the pairing interaction strength leads to a decrease in asymmetric fragment mass distribution and an increase in symmetric distribution. Furthermore, the investigation examines the odd-even mass differences at symmetric and asymmetric fission points, highlighting their sensitivity to changes in the pairing interaction strength. The systematic analysis of Th, U, Pu, and Cm isotopes' fragment mass distributions demonstrates the effectiveness of the model in reproducing experimental data. Additionally, the study explores the effects of the zero-point energy parameter and neck-breaking probability parameter on the fragment mass distribution for $^{240}$Pu. In conclusion, this research provides valuable insights into the fission process by emphasizing the importance of the pairing interaction and its relationship with nuclear elongation.
Peer Review Status:Awaiting Review
Subjects: Physics >> Nuclear Physics submitted time 2024-02-21
Abstract： By the Skyrme density functional theory (DFT), potential energy surfaces (PES) of $^{240}$Pu with constraints on the axial quadrupole and octupole deformations($q_{20}$ and $q_{30}$) are calculated. The volume-like, and the surface-like pairing forces, and the mixing between these two forces are used, within the Hartree-Fock-Bogoliubov (HFB) approximation. The variations of the least-energy fission path, fission barrier, paring energy, total kinetic energy, scission line, and mass distribution of fission fragments by the different forms of paring force are analyzed and discussed. The fission dynamics is studied based on the time-dependent generator coordinate method (TDGCM) plus Gaussian overlap approximation (GOA). The results show a sensitivity of the mass and charge distributions of fission fragments to the form of the pairing force. Based on the investigation of the neutron-induced fission of $^{239}$Pu, among the volume, mixed, and surface pairing forces, the mixed-type of pairing force can give a good reproduction of experimental data.
Peer Review Status:Awaiting Review
Subjects: Physics >> Nuclear Physics submitted time 2025-06-07
Abstract： In current work, the fission property of $^{180}$Hg is investigated based on the Skyrme density functional theory (DFT). The impact of the high-order hexadecapole moment (q$_{40}$) is found at large deformations. With the q$_{40}$ constraint, a smooth and continuous potential energy surfaces (PES) could be obtained. Especially, the hexadecapole moment constraint is essential to get proper scission configurations. The static fission path based on the PES supports the asymmetric fission of $^{180}$Hg. The asymmetric distribution of the fission yields of $^{180}$Hg is further reproduced by the time-dependent generator coordinate method (TDGCM), and agrees well with the experimental data.
Peer Review Status:Awaiting Review
Subjects: Physics >> Nuclear Physics submitted time 2025-05-13
Abstract： In current work, the fission property of $^{180}$Hg is investigated based on the Skyrme density functional theory (DFT). The impact of the high-order hexadecapole moment (q$_{40}$) is found at large deformations. With the q$_{40}$ constraint, a smooth and continuous potential energy surfaces (PES) could be obtained. Especially, the hexadecapole moment constraint is essential to get proper scission configurations. The static fission path based on the PES supports the asymmetric fission of $^{180}$Hg. The asymmetric distribution of the fission yields of $^{180}$Hg is further reproduced by the time-dependent generator coordinate method (TDGCM), and agrees well with the experimental data.
Peer Review Status:Awaiting Review
Subjects: Physics >> Nuclear Physics submitted time 2025-03-29
Abstract： In current work, the fission property of $^{180}$Hg is investigated based on the Skyrme density functional theory (DFT). The impact of the high-order hexadecapole moment (q$_{40}$) is found at large deformations. With the q$_{40}$ constraint, a smooth and continuous potential energy surfaces (PES) could be obtained. Especially, the hexadecapole moment constraint is essential to get proper scission configurations. The static fission path based on the PES supports the asymmetric fission of $^{180}$Hg. The asymmetric distribution of the fission yields of $^{180}$Hg is further reproduced by the time-dependent generator coordinate method (TDGCM), and agrees well with the experimental data.
Peer Review Status:Awaiting Review
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