Probing the Linewidth of the 12.4-keV Sc Isomeric Resonance in Solids by Nuclear Forward Scattering
Using the European XFEL, researchers investigated the Sc nuclear isomer in various solid-state environments and found that while the long-lived excitation persists, significant dephasing in crystals at 20 K broadens the resonance linewidth by a factor of at least 500, establishing critical quantitative constraints for future nuclear-clock metrology.