Angular Momentum Projected Configuration Interaction with Realistic Hamiltonians

TL;DR

This paper introduces an improved Projected Configuration Interaction (PCI) method that efficiently constructs correlated wave functions with good symmetry using realistic Hamiltonians, and demonstrates its accuracy against full CI calculations in various nuclear models.

Contribution

It presents a novel, efficient basis selection technique for PCI that achieves results comparable to full CI calculations with reduced computational effort.

Findings

PCI results agree well with full CI calculations

The method is effective in sd and pf shell nuclei

Demonstrated on nuclei like 24Mg, 28Si, 48Cr, 52Fe, 56Ni

Abstract

The Projected Configuration Interaction (PCI) method starts from a collection of mean-field wave functions, and builds up correlated wave functions of good symmetry. It relies on the Generator Coordinator Method (GCM) techniques, but it improves the past approaches by a very efficient method of selecting the basis states. We use the same realistic Hamiltonians and model spaces as the Configuration Interaction (CI) method, and compare the results with the full CI calculations in the sd and pf shell. Examples of 24Mg, 28Si, 48Cr, 52Fe and 56Ni are discussed.