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The nuclear two-photon or double-gamma ( ) decay is a second-order electromagnetic process whereby a nucleus in an excited state emits two gamma rays simultaneously. To be able to directly measure the decay rate in the low-energy regime below the electron-positron pair-creation threshold, we combined the isochronous mode of a storage ring with Schottky resonant cavities. The newly developed technique can be applied to isomers with excitation energies down to and half-lives as short as . The half-life for the decay of the first-excited state in bare ions was determined to be 23.9(6) ms, which strongly deviates from expectations. Published by the American Physical Society2024more » « less
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