Improved limits on β− and β−β− decays of 48Ca |
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| Authors: | A Bakalyarov A Balysh A S Barabash P Beneš Ch Briançon V Brudanin P Čermák V Egorov F Hubert Ph Hubert N A Korolev V N Kosjakov A Kovalik N A Lebedev V I Lebedev A F Novgorodov N I Rukhadze N I Štekl V V Timkin I E Veleshko Ts Vylov V I Umatov |
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| Institution: | (1) Russian Research Centre Kurchatov Institute, Kurchatov Square, Moscow, 123182, Russia;(2) Institute of Theoretical and Experimental Physics, Moscow, 117259, Russia;(3) FNSPE, Czech Technical University, 11519 Prague, Czech Republic;(4) Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, IN2P3-CNRS et Université Paris-Sud, 91405 Orsay, France;(5) Joint Institute for Nuclear Research, Dubna, Moscow region, 141980, Russia;(6) Centre d’études Nucléaires, IN2P3-CNRS et Université de Bordeaux, F-33170 Gradignan, France |
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| Abstract: | New limits on 48Caβ? and β?β? decays to excited states of 48Ti have been obtained using a 400 cm3 low-background HPGe detector and an external source of 24.558 g enriched CaF2 powder (9.822 g of 48Ca). The limits for β? decay to the 6+ ground state and excited 5+ and 4+ states in 48Sc are 1.6×1020 yr, 2.5×1020 yr, and 1.9×1020 yr at the 90% confidence level. For the β?β? decay to 48Ti, the limits to the first 2+, second 2+, and first 0+ excited states are 1.8×1020 yr, 1.5×1020 yr, and 1.5×1020 yr, again at the 90% confidence level. |
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