arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0704.0496nucl-th
收藏

用含时Hartree-Fock理论研究核聚变过程的预平衡巨偶极共振

Fusion process studied with preequilibrium giant dipole resonance in time dependent Hartree-Fock theory

Cédric Simenel, Philippe Chomaz, Gilles De France

摘要:

本文用含时Hartree-Fock理论研究了重核熔合过程中宏观自由度的平衡,如电荷和形状。用预平衡巨偶极共振(GDR)探测了N/Z非对称核聚变过程,结果表明,这种等矢量集体态在N/Z非对称核聚变中被激发,在质量非对称核聚变中激发程度较低。这种GDR的特性取决于熔融系统在其预平衡相的结构,如其变形,旋转和振动。特别是,我们表明,降低的预平衡GDR的能量相比,统计的。重新审视实验数据,我们首次提取了这种降低的证据。我们还量化了由于从预平衡GDR的伽马射线发射的融合蒸发增强。这种沿聚变路径的冷却机制可能适用于将来在入口通道中使用具有强N/Z不对称性的放射性核束合成超重元素。

英文摘要:

The equilibration of macroscopic degrees of freedom during the fusion of heavy nuclei, like the charge and the shape, are studied in the Time-Dependent Hartree-Fock theory. The pre-equilibrium Giant Dipole Resonance (GDR) is used to probe the fusion path. It is shown that such isovector collective state is excited in N/Z asymmetric fusion and to a less extent in mass asymmetric systems. The characteristics of this GDR are governed by the structure of the fused system in its preequilibrium phase, like its deformation, rotation and vibration. In particular, we show that a lowering of the pre-equilibrium GDR energy is expected as compared to the statistical one. Revisiting experimental data, we extract an evidence of this lowering for the first time. We also quantify the fusion-evaporation enhancement due to gamma-ray emission from the pre-equilibrium GDR. This cooling mechanism along the fusion path may be suitable to synthesize in the future super heavy elements using radioactive beams with strong N/Z asymmetries in the entrance channel.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑