Nuclear Theory2026-07-093 minarXiv:2607.08941Crystalline Acoustics of a Nuclear WhisperThorium-229 harbors a secret: its nucleus possesses the lowest excited state among all known nuclides — 8.35 eV.Udeshika C. Perera·H. B. Tran Tan·H. W. T. Morgan·Eric Hudson·Daniel A. Rehn·Andrei DereviankoFermi's golden ruleMaxwell's equationsLeo EsakiWilliam Lawrence Braggband structurespectroscopy👍👎☆SimplePopularAdvanced