Researchers at the Physical Research Laboratory have performed calculations on sodium (Na) to resolve discrepancies between previous theoretical predictions and experimental data regarding hyperfine structure constants. Their work utilizes relativistic coupled-cluster theory, including triple excitations, to better understand electron correlation and its impact on the nuclear region of the atom. Researchers at the Physical Research Laboratory are reconciling discrepancies between theoretical calculations and experimental results for sodium-23, a surprisingly complex challenge given the atom’s relatively light mass. The team, led by Vaibhav K... [6414 chars]