Resonant X-ray excitation of the 45Sc nuclear isomeric state was achieved by irradiation of a Sc-metal foil with 12.4-keV photon pulses from a state-of-the-art X-ray free-electron laser, allowing a high-precision determination of the transition energy.
- Yuri Shvyd’ko
- Ralf Röhlsberger
- Tomasz Kolodziej