2024/08/01 by X. Zhang, Zhang, X., Clay C. C. Wang +5 · 1 citation
Chemical Engineering · Chemistry · #Catalysis and Oxidation Reactions #Chemical Thermodynamics and Molecular Structure
paper · pdf · doi:10.48550/arxiv.2408.00691
Multireference density functional theory (MR-DFT) has been a pivotal method for studying nuclear low-lying states and neutrinoless double-beta (0νββ) 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 0νββ decay in the two heaviest candidate nuclei. Our findings reveal generally strong correlations between the NMEs of 0νββ decay and the excitation energy of the 21+ 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.