Precision Spectroscopy Highlights Discrepancies Between Theory and Experiment

TL;DR Summary
Recent high-precision spectroscopy experiments on helium isotopes reaffirm a significant discrepancy between theoretical calculations and experimental measurements of the ionization energy of the helium-3 and helium-4 triplet states, suggesting potential new physics or unknown interactions affecting only the triplet spectrum.
Precision Spectroscopy Reaffirms Gap Between Theory and Experiment American Physical Society
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