München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 60: Nuclear Astrophysics V

HK 60.4: Talk

Friday, March 22, 2019, 15:00–15:15, HS 16

Preparation for the measurement of the bound-state beta-decay of bare ²⁰⁵Tl ions at the ESR — •Ragandeep S. Sidhu, Rui Jiu Chen, and Yuri A. Litvinov — GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany

In bound-state beta-decay [1,2], a neutron inside a nucleus transforms into a proton, an anti-neutrino (produced in a free state), and an electron which is created in a bound atomic state. The determination of the bound-state beta-decay rate of fully-ionized ²⁰⁵Tl is needed to determine the matrix element for the electron capture decay of the 2.3 keV excited state in ²⁰⁵Pb to the ground state of ²⁰⁵Tl [3]. The latter is important for the determination of the neutrino-capture probability on ²⁰⁵Tl and, in turn, within the LOREX project the solar pp neutrino flux for over 4.3 Ma. The Experimental Storage Ring (ESR) at GSI, Darmstadt provides an unrivaled opportunity to allow for the corresponding decay studies. The report on the preparations for the bound-state beta-decay for bare ²⁰⁵Tl ions will be given. [1] R. Daudel, M. Jean and M. Lecoin, J. Phys. Radium 8, 238 (1947). [2] J. N. Bahcall, Phys. Rev. 124, 495 (1961). [3] M.K. Pevicevic et al., Nucl. Instr. and Meth. A 621, 282 (2010).