Dominant Modes in Light Nuclei - Ab Initio View of Emergent Symmetries

J P Draayer,K D Launey,D Langr,A C Dreyfuss,T Dytrych

doi:10.1088/1742-6596/578/1/012010

Abstract

An innovative symmetry-guided concept is discussed with a focus on emergent symmetry patterns in complex nuclei. In particular, the ab initio symmetry-adapted no-core shell model (SA-NCSM), which capitalizes on exact as well as partial symmetries that underpin the structure of nuclei, provides remarkable insight into how simple symmetry patterns emerge in the many-body nuclear dynamics from first principles. This ab initio view is complemented by a fully microscopic no-core symplectic shell-model framework (NCSpM), which, in turn, informs key features of the primary physics responsible for the emergent phenomena of large deformation and alpha-cluster substructures in studies of the challenging Hoyle state in Carbon-12 and enhanced collectivity in intermediate-mass nuclei. Furthermore, by recognizing that deformed configurations often dominate the low-energy regime, the SA-NCSM provides a strategy for determining the nature of bound states of nuclei in terms of a relatively small subspace of the symmetry-reorganized complete model space, which opens new domains of nuclei for ab initio investigations, namely, the intermediate-mass region, including isotopes of Ne, Mg, and Si.

Highlights

The ab initio symmetry-adapted no-core shell-model (SA-NCSM), with results that corroborate and are complementary to those enabled within the framework of the no-core shell model (NCSM) [1], and which can be used to facilitate ab initio applications to challenging lower sdshell nuclei, reveal that bound states of light nuclei are dominated by high-deformation and lowspin configurations [2]
The study of 12C includes the elusive first excited 0+2 state, known as the Hoyle state that was predicted based on observed abundances of heavy elements in the universe [15], and which has attracted much recent attention
In the framework of the symmetry-adapted no-core shell model (SA-NCSM), we show the emergence of orderly patterns from first principles [2]

Summary

Langr Czech Technical University in Prague

Follow this and additional works at: https://digitalcommons.lsu.edu/physics_astronomy_pubs. Recommended Citation Draayer, J., Dytrych, T., Launey, K., Dreyfuss, A., & Langr, D. Dominant Modes in Light Nuclei - Ab Initio View of Emergent Symmetries. View the article online for updates and enhancements. - Ab initio many-body perturbation theory and no-core shell model B. - 7Be(p,)8B S-factor from ab initio wave functions P Navratil, C A Bertulani and E Caurier. - Emergent symmetries in atomic nuclei from first principles K D Launey, A C Dreyfuss, R B Baker et al. - Efficacy of the SU(3) scheme for ab initio large-scale calculations beyond the lightest nuclei T. This content was downloaded from IP address 130.39.60.163 on 15/10/2021 at 20:43

Introduction

NCSpM model – physics responsible for simple pattern formation

Findings

Conclusion