Bound-State Beta Decay of 205Tl81+ Ions and the LOREX Project

E121 Collaboration; LOREX Collaboration; Sidhu, R. S.; Leckenby, G.; Chen, R. J.; Mancino, R.; Neff, T.; Litvinov, Yu. A.; Martínez-Pinedo, G.; Amthauer, G.; Bai, M.; Blaum, K.; Boev, B.; Bosch, F.; Brandau, C.; Cvetković, V.; Dickel, T.; Dillmann, I.; Dmytriiev, D.; Faestermann, T.; Forstner, O.; Franczak, B.; Geissel, H.; Gernhäuser, R.; Glorius, J.; Griffin, C. J.; Gumberidze, A.; Haettner, E.; Hillenbrand, P.-M.; Kienle, P.; Korten, W.; Kozhuharov, Ch.; Kuzminchuk, N.; Langanke, K.; Litvinov, S.; Menz, E.; Morgenroth, T.; Nociforo, C.; Nolden, F.; Pavićević, M. K.; Petridis, N.; Popp, U.; Purushothaman, S.; Reifarth, R.; Sanjari, M. S.; Scheidenberger, C.; Spillmann, U.; Steck, M.; Stöhlker, Th.; Tanaka, Y. K.; Trassinelli, M.; Trotsenko, S.; Varga, L.; Wang, M.; Weick, H.; Woods, P. J.; Yamaguchi, T.; Zhang, Y. H.

doi:10.1103/PhysRevLett.133.232701

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Bound-State Beta Decay of ²⁰⁵Tl⁸¹⁺ Ions and the LOREX Project

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Sidhu, R. S.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Chen, R. J.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Blaum, K.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.133.232701
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Citation

E121 Collaboration, LOREX Collaboration, Sidhu, R. S., Leckenby, G., Chen, R. J., Mancino, R., et al. (2024). Bound-State Beta Decay of ²⁰⁵Tl⁸¹⁺ Ions and the LOREX Project. Physical Review Letters, 133(23): 232701. doi:10.1103/PhysRevLett.133.232701.

Cite as: https://hdl.handle.net/21.11116/0000-0010-4410-F

Abstract

Stable ²⁰⁵Tl ions have the lowest known energy threshold for capturing electron neutrinos (v_e) of E_{v_e}≥50.6 keV. The Lorandite Experiment (LOREX), proposed in the 1980s, aims at obtaining the longtime averaged solar neutrino flux by utilizing natural deposits of Tl-bearing lorandite ores. To determine the v_e capture cross section, it is required to know the strength of the weak transition connecting the ground state of ²⁰⁵Tl and the 2.3 keV first excited state in ²⁰⁵Pb. The only way to experimentally address this transition is to measure the bound-state beta decay (ßb) of fully ionized ²⁰⁵Tl⁸¹⁺ ions. After three decades of meticulous preparation, the half-life of the ßb decay of ²⁰⁵Tl⁸¹⁺ has been measured to be 291₋₂₇⁺³³ days using the Experimental Storage Ring (ESR) at GSI, Darmstadt. The longer measured half-life compared to theoretical estimates reduces the expected signal-to-noise ratio in the LOREX, thus challenging its feasibility.