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

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

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

Journal Article · Thu Jul 11 00:00:00 EDT 2024 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.133.022502· OSTI ID:2397017

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

Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 2397017

Alternate ID(s):: OSTI ID: 2529448

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 2 Vol. 133; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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