2019/10/07 by Andreas Ekström, Gaute Hagen · 1 citation
Physics and Astronomy · #nucl-th
paper · pdf · doi:10.1103/physrevlett.123.252501
published as Phys. Rev. Lett. 123, 252501 (2019) · 6 pages, 3 figures, Supplemental Material provided as ancillary material
arxiv created 2019/10/07 · arxiv updated 2019/12/25
We perform a global sensitivity analysis of the binding energy and the charge radius of the nucleus 16O to identify the most influential low-energy constants in the next-to-next-to-leading order chiral Hamiltonian with two- and three-nucleon forces. For this purpose we develop a subspace-projected coupled-cluster method using eigenvector continuation [Frame D. et al., Phys. Rev. Lett. 121, 032501 (2018)]. With this method we compute the binding energy and charge radius of 16O at more than one million different values of the 16 low-energy constants in one hour on a standard laptop. For relatively small subspace projections, the root-mean-square error is about 1% compared to full space coupled-cluster results. We find that 58(1)% of the variance in the energy can be apportioned to a single contact-term in the 3S1-wave, whereas the radius depends sensitively on several low-energy constants and their higher-order correlations. The results identify the most important parameters for describing nuclear saturation, and help prioritize efforts for uncertainty reduction of theoretical predictions. The achieved acceleration opens up for an array of computational statistics analyses of the underlying description of the strong nuclear interaction in nuclei across the Segré chart.