arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2101.07584nucl-th
收藏

含时密度矩阵方法一致实现中的核基态

Nuclear ground states in a consistent implementation of the time-dependent density matrix approach

M. C. Barton, P. D. Stevenson, A. Rios

摘要:

背景:核理论中的含时技术通常依赖于平均场或Hartree-Fock描述。含时密度矩阵(TDDM)理论在平均场之外的动力学计算中常常会引入对称性限制,而忽略了平均场与诱导相互作用之间的联系。目的:我们研究了从$A=12$到$A=24$的原子核在TDDM方法中获得的基态,包括有和没有内禀形变的偶核和奇-偶核的例子。我们克服了以前的限制,使用三维模拟和采用密度无关的Skyrme相互作用自洽。研究方法:从Hartree-Fock解开始,通过实时绝热包含超越平均场项,找到相关的基态。结果:我们发现,在这种方法中,相关性负责总能量的$\approx 4-5 \%$。半径通常不受引入超越平均场相关性的影响。大的核关联熵与大的关联能相关联。通过所有测量,$^{12}$ C是所考虑的质量区域中最相关的同位素。结论:我们的工作是一个一致的实施TDDM技术应用到核反应的起点。我们的研究结果表明,结构中的相关效应很小,但超越平均场动力学模拟可以提供新的见解几个感兴趣的问题。

英文摘要:

Background: Time-dependent techniques in nuclear theory often rely on mean-field or Hartree-Fock descriptions. Beyond mean-field dynamical calculations within the time-dependent density matrix (TDDM) theory have often invoked symmetry restrictions and ignored the connection between the mean-field and the induced interaction. Purpose: We study the ground states obtained in a TDDM approach for nuclei from $A=12$ to $A=24$, including examples of even and odd-even nuclei with and without intrinsic deformation. We overcome previous limitations using three-dimensional simulations and employ density-independent Skyrme interactions self-consistently. Methods: The correlated ground states are found starting from the Hartree-Fock solution, by adiabatically including the beyond-mean-field terms in real time. Results: We find that, within this approach, correlations are responsible for $\approx 4-5 \%$ of the total energy. Radii are generally unaffected by the introduction of beyond mean-field correlations. Large nuclear correlation entropies are associated to large correlation energies. By all measures, $^{12}$C is the most correlated isotope in the mass region considered. Conclusions: Our work is the starting point of a consistent implementation of the TDDM technique for applications into nuclear reactions. Our results indicate that correlation effects in structure are small, but beyond-mean-field dynamical simulations could provide new insight into several issues of interest.

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。

↑