We calculate the deuteron charge, electric quadrupole, and magnetic form factors up to next-to-next-to-leading order in chiral effective field theory, treating subleading corrections, especially that of nuclear forces, perturbation theory. examine power counting based on naive dimensional analysis by investigating ultraviolet cutoff variation these factors. find N${}^2$LO factor shows significa...

In this work, a refined Bayesian neural network (BNN) based approach with six inputs including the proton number, mass and engineered features associated pairing effect, shell isospin ``abnormal" shape staggering effect of $^{181,183,185}$Hg, is proposed to accurately describe nuclear charge radii. The new able well radii atomic nuclei $A\ge40$ $Z\ge20$. standard root-mean-square (rms) deviatio...