Bound-State Beta Decay of ^{205}Tl^{81+} Ions and the LOREX Project
Stable ^{205}Tl ions have the lowest known energy threshold for capturing electron neutrinos (ν_{e}) of E_{ν_{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...
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| creator | 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 Zhao, J Zuber, K |
| description | Stable ^{205}Tl ions have the lowest known energy threshold for capturing electron neutrinos (ν_{e}) of E_{ν_{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 ν_{e} capture cross section, it is required to know the strength of the weak transition connecting the ground state of ^{205}Tl and the 2.3 keV first excited state in ^{205}Pb. The only way to experimentally address this transition is to measure the bound-state beta decay (β_{b}) of fully ionized ^{205}Tl^{81+} ions. After three decades of meticulous preparation, the half-life of the β_{b} decay of ^{205}Tl^{81+} 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. |
| doi_str_mv | 10.1103/PhysRevLett.133.232701 |
| format | Article |
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| title | Bound-State Beta Decay of ^{205}Tl^{81+} Ions and the LOREX Project |
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