Symplectic no-core configuration interaction framework for ab initio nuclear structure

TL;DR

This paper presents a new symplectic no-core configuration interaction framework for ab initio nuclear structure calculations, leveraging approximate Sp(3,R) symmetry to efficiently describe nuclear states.

Contribution

It introduces the SpNCCI framework that encodes symplectic symmetry to restrict the many-body space in nuclear structure calculations.

Findings

Symplectic symmetry dominates in individual wave functions.

Families of states related by symplectic symmetry emerge.

The framework effectively captures key nuclear structure features.

Abstract

We introduce a symplectic no-core configuration interaction (SpNCCI) framework for ab initio nuclear structure calculations, in a correlated many-body basis which encodes an approximate Sp(3,R) symmetry of the nucleus. Such a scheme potentially provides a means of restricting the many-body space to include only those highly-excited configurations which dominantly contribute to the nuclear wave function. We examine the symplectic symmetry structure arising in an illustrative ab initio SpNCCI calculation for 6Li. We observe both the dominance of symplectic symmetry in individual wave functions and the emergence of families of states related by symplectic symmetry.