Combinatorial level densities by the real-time method

Abstract
Levels densities of independent-particle fermionic systems can be calculated easily by using the real-time representation of the evolution operator together with the fast Fourier transform. We describe the method and implement it with a set of Python programs. Examples are provided for the total and partial levels densities of a heavy deformed nucleus (164Dy). The partial level densities that may be calculated are the projected ones on neutron number, proton number, azimuthal angular momentum...

Title of program: rt_levels.py
Catalogue Id: AEUI_v1_0

Nature of problem
Compute many-body level densities of finite systems of fermions described by their single-particle spectra

Versions of this program held in the CPC repository in Mendeley Data
AEUI_v1_0; rt_levels.py; 10.1016/j.cpc.2014.08.012

This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2018)

摘要：独立粒子费米子系统的能级密度可借助演化算符的实时表象结合快速傅里叶变换（fast Fourier transform）实现便捷计算。本文阐述该方法，并通过一组Python程序完成了该方法的实现。本文以重形变核素¹⁶⁴Dy为例，给出了其总能级密度与分能级密度的计算实例。可计算的分能级密度包括基于中子数、质子数、方位角动量等物理量的投影分能级密度。

程序名称：rt_levels.py
目录编号：AEUI_v1_0

待解决问题：针对由单粒子谱描述的有限费米子系统，计算其多体能级密度

Mendeley数据集中CPC仓库内收录的本程序版本：AEUI_v1_0；rt_levels.py；10.1016/j.cpc.2014.08.012

本程序源自贝尔法斯特女王大学所维护的CPC程序库（1969-2018）