Year: 2025
Type: article
Abstract: Multireference density functional theory (MR-DFT) has been a pivotal method for studying nuclear low-lying states and neutrinoless double-beta ($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$) decay. However, quantifying their theoretical uncertainties has been a significant challenge due to the computational demands. This study introduces a subspace-projected covariant density functional theory (SP-CDFT), which efficiently emulates MR-CDFT calculations for nuclear low-lying states. This approach leverages the eigenvector continuation method combined with the quantum-number projected generator coordinate method, based on a relativistic energy density functional (EDF). We apply SP-CDFT to investigate the correlations among the physical quantities of nuclear matter, nuclear low-lying spectroscopy, and the nuclear matrix elements (NMEs) of $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ decay in the two heaviest candidate nuclei. Our findings reveal generally strong correlations between the NMEs of $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ decay and the excitation energy of the ${2}_{1}^{+}$ state, as well as the $E2$ transition strength, although these correlations vary significantly among nuclei. This work also paves the way for refining nuclear EDF parameters using spectroscopic data.
Source: Physical Review C
DOI: 10.1103/4cnl-5dnm
Authors: X. Zhang, C. C. Wang, C. R. Ding, J. M. Yao
Institutions: Sun Yat-sen University, Kyoto University
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4413503468