SAMOP 2021 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 4: Storage Rings

MS 4.5: Vortrag

Freitag, 24. September 2021, 15:15–15:30, H2

Mass-spectrometry assisted measurement of the bound-state beta decay of 205Tl81+ ions — •Rui-Jiu Chen, Ragandeep Singh Sidhu, Yuri A Litvinov, and E121 collaboration — GSI Helmholtzzentrumfr Schwerionenforschung, Planckstrae 1, 64291 Darmstadt, Germany

Beta decay of highly charged ions [1] has attracted much attention in recent years. The studies of beta decay of highly charged ions can be performed solely at ion storage rings and ion traps where their high atomic charge states can be preserved for extended periods of time (up to several hours) and the decay products can be identified by using precision mass spectrometry. In this talk, we will 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 at GSI. The experiment is associated with two major physics motivations. One is linked with the LOREX [2] 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 (E > 53 keV) and is thus of utmost significance for extending the neutrino flux to lower energies. The second physics case is associated with the 205Pb-205Tl pair as a s-process cosmochronometer. The measurement is crucial for the clarification of the fate of 205Pb in the early solar system. Reference: [1] Yu. A. Litvinov, F. Bosch, Rep. Prog. Phys. 74, 016301, (2011). [2] M.K. Pevićević et al., Nucl. Instr. and Meth. A 621, 282 (2010).

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