Precision Spectroscopy Highlights Discrepancies Between Theory and Experiment

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Source: American Physical Society
Precision Spectroscopy Highlights Discrepancies Between Theory and Experiment
Photo: American Physical Society
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.

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