一种计算非寄生自旋和宇称相关核能级密度的高性能算法
High-Performance Algorithm for Calculating Non-Spurious Spin- and Parity-Dependent Nuclear Level Densities
摘要：
最近提出了一种新的高性能算法，用于计算自旋和宇称相关的壳模型核能级密度，使用质子-中子形式主义的统计光谱方法。当用于覆盖多个主谐振子壳层的价空间时，该算法将真实的本征态与虚假的质心激发混合。在本文中，我们提出了一种先进的算法，最近提出的统计矩方法的基础上，消除虚假状态。给出了几种sd壳层核的非自然宇称态的计算结果，并与壳层模型的精确计算和实验结果进行了比较。
英文摘要：
A new high-performance algorithm for calculating the spin- and parity-dependent shell model nuclear level densities using methods of statistical spectroscopy in the proton-neutron formalism was recently proposed. When used in valence spaces that cover more than one major harmonic oscillator shell, this algorithm mixes the genuine intrinsic states with spurious center-of-mass excitations. In this paper we present an advanced algorithm, based on the recently proposed statistical moments method, that eliminates the spurious states. Results for unnatural parity states of several sd-shell nuclei are presented and compared with those of exact shell model calculations and experimental data.
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