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  • Measurement of the Isolated Nuclear Two-Photon Decay in \(^{72}\mathrm{Ge}\)
    Freire-Fernández, D; Korten, W; Chen, R J; Litvinov, S; Litvinov, Yu A; Sanjari, M S; Weick, H; Akinci, F C; Albers, H M; Armstrong, M; Banerjee, A; Blaum, K; Brandau, C; Brown, B A; Bruno, C G; Carroll, J J; Chen, X; Chiara, Ch J; Cortes, M L; Dellmann, S F; Dillmann, I; Dmytriiev, D; stner, O; Geissel, H; Glorius, J; Görgen, A; Górska, M; Griffin, C J; Gumberidze, A; Harayama, S; Hess, R; Hubbard, N; Ide, K E; John, Ph R; Joseph, R; Jurado, B; Kalaydjieva, D; Kanika, K; Kondev, F G; Koseoglou, P; Kosir, G; Kozhuharov, Ch; Kulikov, I; Leckenby, G; Lorenz, B; Marsh, J; Mistry, A; Ozawa, A; Pietralla, N; Podolyák, Zs; Polettini, M; Sguazzin, M; Sidhu, R S; Steck, M; Stöhlker, Th; Swartz, J A; Vesic, J; Walker, P M; Yamaguchi, T; Zidarova, R

    arXiv.org, 12/2023
    Paper

    The nuclear two-photon or double-gamma (\(2\gamma\)) 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 \(2\gamma\) 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 \(\sim100\)\,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.

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