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arXiv 0908.1848nucl-th
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具有可分离对力的轴向形变相对论Hartree Bogoliubov

Axially deformed relativistic Hartree Bogoliubov with separable pairing force

Yuan Tian, Zhongyu Ma, Peter Ring

摘要:

在$^{1}S_{0}$通道中引入了一种可分离的对相互作用形式,并成功地用于描述超流核的静态和动态性质。通过调整参数再现了Gogny力在核物质中的配对性质,这种可分离的配对力在描述球形核的基态和振动激发的配对性质上与原Gogny力几乎是一样的。在这篇文章中,我们扩展了这些研究的相对论Hartree Bogoliubov理论在变形核与轴对称(RHBZ)使用相同的可分离配对相互作用。为了保持平移不变性,我们构造一维和二维Talmi-Moshinsky括号的圆柱谐振子基础。我们表明,这种力的矩阵元素,然后可以扩大在一系列的可分离的条款。这种扩展的收敛性研究各种变形。我们观察到一个相对较快的收敛。这使得计算时间大大减少相比,RHBZ计算与完整的Gogny力的配对通道。作为一个例子,我们解决了RHBZ方程与此可分离的配对力的基态的Sm-同位素链。与实验数据以及与其他理论结果取得了很好的一致性。

英文摘要:

A separable form of pairing interaction in the $^{1}S_{0}$ channel has been introduced and successfully applied in the description of both static and dynamic properties of superfluid nuclei. By adjusting the parameters to reproduce the pairing properties of the Gogny force in nuclear matter, this separable pairing force is successful in depicting the pairing properties of ground states and vibrational excitations of spherical nuclei on almost the same footing as the original Gogny force. In this article, we extend these investigations for Relativistic Hartree Bogoliubov theory in deformed nuclei with axial symmetry (RHBZ) using the same separable pairing interaction. In order to preserve translational invariance we construct one- and two-dimensional Talmi-Moshinsky brackets for the cylindrical harmonic oscillator basis. We show that the matrix elements of this force can then be expanded in a series of separable terms. The convergence of this expansion is investigated for various deformations. We observe a relatively fast convergence. This allows for a considerable reduction in computing time as compared to RHBZ-calculations with the full Gogny force in the pairing channel. As an example we solve the RHBZ equations with this separable pairing force for the ground states of the chain of Sm-isotopes. Good agreement with the experimental data as well as with other theoretical results is achieved.

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