Erlangen 2022 – scientific programme
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MS: Fachverband Massenspektrometrie
MS 9: Ion Storage Rings
MS 9.4: Talk
Thursday, March 17, 2022, 15:00–15:15, MS-H9
Search of the exotic nuclear two-photon emission decay in isochronous heavy ion storage rings — •David Freire1,2,3,4, F. Çağla Akinci5, Klaus Blaum1,2, Wolfram Korten3, Yuri A. Litvinov2,4, Shahab Sanjari4,6, and the E143 Collaboration4 — 1Max Planck Institute for Nuclear Physics, D-69117 Heidelberg, Germany — 2Heidelberg University, D-69117 Heidelberg, Germany — 3IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France — 4GSI Helmholtz Center, D-64291 Darmstadt, Germany — 5Istanbul University, T-34452 Istanbul, Turkey — 6Aachen University of Applied Sciences, D-52005 Aachen, Germany
The nuclear two-photon (2γ) decay is a rare decay mode in atomic nuclei whereby a nucleus in an excited state emits two gamma rays simultaneously. First order processes usually dominate the decay, however two-photon emission may become significant when first order processes are forbidden or strongly retarded, which can be achieved at the experimental storage ring ESR (GSI/FAIR). Within this work we will present the implemented methodology and the obtained results of two beam times performed in 2021, when for the first time the isochronous mode of ESR alongside non-destructive Schottky detectors were operated for the study of short-lived isomer production yields and lifetimes. We investigated specifically the isotope 72Ge, as it is the most easily accessible nucleus having a first excited 0+ state below the pair creation threshold paramount for the study of 2γ decay without competition of first order decays. In addition, the nuclei 70Se and 72Br were studied, as their isomeric states play a major role in nuclear astrophysics.