Extended Data Fig. 2: Dependences of the ground-state energy on the cutoff parameter of the V_lowk approach.

The ground-state expectation value of the effective NN interaction originating in the χEFT NN forces by Entem and Machleidt^22,53 (Methods) are shown for the Ne and Mg isotopes. a, Ne; b, Mg. For each isotope, the second (orange), third (red) and fourth (grey) columns depict, respectively, this quantity obtained with the cutoff parameter Λ_Vlowk = 1.8 fm⁻¹, 2.0 fm⁻¹ and 2.2 fm⁻¹ by the second-order \(\hat{Q}\)-box calculation in the EKK process. For comparison, the third-order \(\hat{Q}\)-box result with Λ_Vlowk = 2.0 fm⁻¹ is shown by the first (green) column. All values are shown relative to their corresponding N = 16 values.