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arXiv 1808.08077nucl-th
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用高阶集体坐标算符研究大振幅集体运动

Adiabatic approach to large-amplitude collective motion with the higher-order collective-coordinate operator

Koichi Sato

摘要:

基于绝热自洽集体坐标(ASCC)理论,提出了一组新的包含二阶集体坐标算符的集体哈密顿量的确定方程.我们用二能级Lipkin模型证明了包括二阶算子在内的集体算子是自洽决定的。我们比较了有和没有二阶算子的计算结果,并表明,没有二阶算子,与精确解的协议变得更差的激发能的增加,但与二阶算子,精确解是很好地再现,即使是高激发态。我们还重新考虑了在只考虑一阶算子的情况下,应该采用哪些方程作为基本方程,并提出了一套替代的基本方程,而不是传统的ASCC方程。此外,我们还简要地讨论了本文提出的新基本方程的规范对称性。

英文摘要:

We propose a new set of equations to determine the collective Hamiltonian including the second-order collective-coordinate operator on the basis of the adiabatic self-consistent collective-coordinate (ASCC) theory. We illustrate, with the two-level Lipkin model, that the collective operators including the second-order one are self-consistently determined. We compare the results of the calculations with and without the second-order operator and show that, without the second-order operator, the agreement with the exact solution becomes worse as the excitation energy increases, but that, with the second-order operator included, the exact solution is well reproduced even for highly excited states. We also reconsider which equations one should adopt as the basic equations in the case where only the first-order operator is taken into account, and suggest an alternative set of fundamental equations instead of the conventional ASCC equations. Moreover, we briefly discuss the gauge symmetry of the new basic equations we propose in this paper.

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。

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