Nature(London) 617, 706 (2023)

S.Kraemer, J.Moens, M.Athanasakis-Kaklamanakis, S.Bara, K.Beeks, P.Chhetri, K.Chrysalidis, A.Claessens, T.E.Cocolios, J.G.M.Correia, H.De Witte, R.Ferrer, S.Geldhof, R.Heinke, N.Hosseini, M.Huyse, U.Koster, Y.Kudryavtsev, M.Laatiaoui, R.Lica, G.Magchiels, V.Manea, C.Merckling, L.M.C.Pereira, S.Raeder, T.Schumm, S.Sels, P.G.Thirolf, S.M.Tunhuma, P.Van Den Bergh, P.Van Duppen, A.Vantomme, M.Verlinde, R.Villarreal, U.Wahl

Observation of the radiative decay of the ²²⁹Th nuclear clock isomer

RADIOACTIVITY ²²⁹Ac(β^-), ²²⁹Th(IT) [from U(p, X), E=1.4 GeV]; measured decay products, Eγ, Iγ; deduced isomeric transition energies and T_1/2. Comparison with available data. The ISOLDE facility at CERN.

doi: 10.1038/s41586-023-05894-z