Measurement of the Isolated Nuclear Two-Photon Decay in 72Ge

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, C. J.; Cortes, M. L.; Dellmann, S. F.; Dillmann, I.; Dmytriiev, D.; Forstner, 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,; 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.

doi:10.1103/PhysRevLett.133.022502

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Measurement of the Isolated Nuclear Two-Photon Decay in ⁷²Ge

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Freire-Fernández, D.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Blaum, K.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.133.022502
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Citation

Freire-Fernández, D., Korten, W., Chen, R., Litvinov, S., Litvinov, Y., Sanjari, M., et al. (2024). Measurement of the Isolated Nuclear Two-Photon Decay in ⁷²Ge. Physical Review Letters, 133(2): 022502. doi:10.1103/PhysRevLett.133.022502.

Cite as: https://hdl.handle.net/21.11116/0000-000F-8A7C-B

Abstract

The nuclear two-photon or double-gamma (2y) 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⁢⁢y 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 ∼100 keV and half-lives as short as ∼10 ms. The half-life for the 2⁢y decay of the first-excited 0⁺ state in bare ⁷²Ge ions was determined to be 23.9(6) ms, which strongly deviates from expectations.