分类: 物理学 >> 核物理学 提交时间: 2023-12-28
摘要: In this study, the effect of extreme laser fields on the decay process of ground-state eveneven nuclei was investigated. Using the deformed Gamow-like model, we found that state-of-the-art lasers can cause a slight change in the decay penetration probability of most nuclei. In addition, we studied the correlation between the rate of change of the decay penetration probability and angle between the directions of the laser electric field and particle emission for different nuclei. Based on this correlation, the average effect of extreme laser fields on the half-life of many nuclei with arbitrary particle emission angles was calculated. The calculations show that the laser suppression and promotion effects on the decay penetration probability of the nuclei population with completely random particle-emission directions are not completely canceled. The remainder led to a change in the average penetration probability of the nuclei. Furthermore, the possibility of achieving a higher average rate of change by altering the spatial shape of the laser is explored. We conclude that circularly polarized lasers may be helpful in future experiments to achieve a more significant average rate of change of the decay half-life of the nuclei population.
分类: 物理学 >> 核物理学 提交时间: 2025-04-24
摘要: This study analyzes the ternary fission of the 256Fm isotope in the fragments collinear geometry with A2, and A3 fragments located in the middle position, incorporating 16O and 40Ca as accom panied particles. The driving potentials were calculated using the Proximity, the Aky¨uz-Winther, and the Broglia-Winther potentials, to assess their influence on the fission process for each available fragments configurations. Among all possible configurations, fragments combinations with posi tive Q-values were selected and grouped based on their proton numbers (Z) for a comprehensive comparison. The calculated results indicate that the collinear geometry is energetically favorable, with variations in driving potential highlighting the impact of nuclear structure, such as magic and near-magic nuclei, on selection of combinations. The interaction barrier includes Coulomb, nuclear and centrifugal potentials. In order to check the effects of nuclear potential, three type of potential are considered. The comparative analysis between the Proximity, the Aky¨uz-Winther, and the Broglia-Winther potentials reveals notable differences in values of penetration probabilities and decay constants. These findings provide critical insights into the mechanisms governing the ternary fission and the role of nuclear structure in determining fragment configurations.
分类: 物理学 >> 核物理学 提交时间: 2024-12-31
摘要: This study explores the ternary fission of the 254Cf isotope, focusing on various fragmentation in the collinear and the equatorial fragment geometries. The analysis considers the role of magic, double-magic, and even-even fragments in determining the driving potential, the penetration probabilities, the yields, and the decay constants. The results show that the collinear geometry is energetically favored due to lower driving potential, especially when magic or near-magic fragments are involved. Also, the kinetic energy distribution of the fragments are calculated for various combinations. Using the momentum and the energy conservation, the fission Q-value is shared among the fragments in various fragmentation. The results indicate that collinear geometries lead to a more balanced energy distribution, when lighter fragments located at the middle. This agrees well with the observations and provides a clearer picture of the energy dynamics in ternary fission. These findings highlight the influence of the nuclear structure on fragment selection and the energy partitioning, offering new insights into the mechanism for ternary fission of heavy nuclei.