论文标题
4He在多条孔中的光谱特性
Spectroscopic properties of 4He within a multiphonon approach
论文作者
论文摘要
在运动声子法方程中研究了4HE的批量和光谱特性。这种方法生成了由粒子 - 孔 - 孔tamm-dancoff声子的张量产物组成的n-phonon（n = 0、1、2、3 ...）的基础，然后在此基础上解决了完整的特征值问题。该方法不依赖于任何近似值，并且没有质量中心引起的任何污染，这是由于利用矩形矩阵的奇异值分解的过程。两个电势均来自手性有效场理论，在在包括多达三个声子在内的空间内进行的自洽计算中采用。后一种基础状态在简化的假设下进行处理。与实验数据的比较分析指出了这两个电势的不同性能。它还表明该计算仅在光谱特性的描述中部分成功，并提出了进一步改进的秘诀。
Bulk and spectroscopic properties of 4He are studied within an equation of motion phonon method. Such a method generates a basis of n-phonon (n = 0, 1, 2, 3...) states composed of tensor products of particle-hole Tamm-Dancoff phonons and then solves the full eigenvalue problem in such a basis. The method does not rely on any approximation and is free of any contamination induced by the center of mass, in virtue of a procedure exploiting the singular value decomposition of rectangular matrices. Two potentials, both derived from the chiral effective field theory, are adopted in a self-consistent calculation performed within a space including up to three phonons. The latter basis states are treated under a simplifying assumption. A comparative analysis with the experimental data points out the different performances of the two potentials. It shows also that the calculation succeeds only partially in the description of the spectroscopic properties and suggests a recipe for further improvements.
