Freiburg 2024 – scientific programme
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MS: Fachverband Massenspektrometrie
MS 2: New Methods, Applications, Storage Rings
MS 2.1: Invited Talk
Monday, March 11, 2024, 17:00–17:30, HS 3042
Measurement of the bound-state beta decay of 205Tl81+ ions at heavy-ion storage ring — •Ruijiu Chen1, Jan Glorius1, Guy Leckenby2, Yury A Litvinov1, Maria Lugaro4, Riccardo Mancino1, Mohammad Shahab Sanjari1, Ragandeep Singh Sidhu1, and Balazs Szanyi3 for the E121 collaboration collaboration — 1GSI, Germany — 2TRIUMF, Canada — 3University of Szeged, Hungary — 4Konkoly Observatory, Hungary
Heavy-Ion storage rings offer unparalleled capabilities for the measurement of the radioactive decay of highly charged ions. In this talk, we report on the recent results from the first direct measurement of the bound-state beta decay of bare 205Tl81+ ions. The experiment was performed in March-April 2020 by employing the unique accelerator facility at GSI. The measurement is associated with two major physics motivations. One is linked with the LOREX project (acronym of LORandite EXperiment) wherein the measurement is needed to determine the matrix element for the pp neutrino capture by the ground state of 205Tl to the 2.3 keV excited state in 205Pb. This capture reaction has by far the lowest threshold (Eνe > 53 keV) and is only experiment capable of extending the neutrino flux to lower energies. The second physics case is associated with the 205Pb/205Tl pair as a s-process cosmochronometer. In stellar plasmas, 205Tl can exist in ionized form and βb decay to the first excited state of 205Pb can counter-balance the reduction of 205Pb ions due to electron capture process. The measurement is crucial for predicting the 205Pb expected in meteorites in the early solar system.
Keywords: Storage Ring; Bound-state beta decay