Fast & rigorous predictions for $A=6$ nuclei with Bayesian posterior sampling

Understand

We make ab initio predictions for the A = 6 nuclear level scheme based on two- and three-nucleon interactions up to next-to-next-to-leading order in chiral effective field theory ($\chi$EFT).

• We utilize eigenvector continuation and Bayesian methods to quantify uncertainties stemming from the many-body method, the $\chi$EFT truncation, and the low-energy constants of the nuclear interaction.
• The construction and validation of emulators is made possible via the development of JupiterNCSM -- a new M-scheme no-core shell model code that uses on-the-fly Hamiltonian matrix construction for efficient, single-node computations up to $N_\mathrm{max} = 10$ for ${}^{6}\mathrm{Li}$.
• We find a slight underbinding of ${}^{6}\mathrm{He}$ and ${}^{6}\mathrm{Li}$, although consistent with experimental data given our theoretical error bars.