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arXiv 1403.2671nucl-th
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含时超流局域密度近似下的相对论库仑激发

Relativistic Coulomb excitation within Time Dependent Superfluid Local Density Approximation

I. Stetcu, C. Bertulani, A. Bulgac, P. Magierski, K. J. Roche

摘要:

在非限制含时密度泛函理论的框架下,我们首次对重形变开壳层核$^{238}$ U的相对论库仑激发进行了分析。该方法是基于超流局域密度近似(SLDA)制定的空间晶格,可以考虑耦合到连续,使自洽研究的超流动力学的任何核形状。我们计算了沉积在靶核中的能量作为碰撞参量的函数,发现它明显大于使用Goldhaber-Teller模型的估计。在此过程中激发出等矢量巨偶极共振、偶极侏儒共振和巨四极模。集体偶极模式的一个身体耗散示出导致阻尼宽度$Γ_\downarrow \approx 0.4$兆电子伏和发射的预平衡中子的数量已被量化。

英文摘要:

Within the framework of the unrestricted time-dependent density functional theory, we present for the first time an analysis of the relativistic Coulomb excitation of the heavy deformed open shell nucleus $^{238}$U. The approach is based on Superfluid Local Density Approximation (SLDA) formulated on a spatial lattice that can take into account coupling to the continuum, enabling self-consistent studies of superfluid dynamics of any nuclear shape. We have computed the energy deposited in the target nucleus as a function of the impact parameter, finding it to be significantly larger than the estimate using the Goldhaber-Teller model. The isovector giant dipole resonance, the dipole pygmy resonance and giant quadrupole modes were excited during the process. The one body dissipation of collective dipole modes is shown to lead a damping width $Γ_\downarrow \approx 0.4$ MeV and the number of pre-equilibrium neutrons emitted has been quantified.

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