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The nuclear two-photon or double-gamma ($2\gamma$) decay is a second-orderelectromagnetic process whereby a nucleus in an excited state emits two gammarays simultaneously. To be able to directly measure the $2\gamma$ decay rate inthe low-energy regime below the electron-positron pair-creation threshold, wecombined the isochronous mode of a storage ring with Schottky resonantcavities. The newly developed technique can be applied to isomers withexcitation energies down to $\sim100$\,keV and half-lives as short as$\sim10$\,ms. The half-life for the $2\gamma$ decay of the first-excited $0^+$state in bare $^{72}\mathrm{Ge}$ ions was determined to be$23.9\left(6\right)$\,ms, which strongly deviates from expectations.

Measurement of the Isolated Nuclear Two-Photon Decay in $^{72}\mathrm{Ge}$