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| VOLUME 76 (2002) | ISSUE 9 | PAGE 643 |
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Improved limits on β- and β-β- decays of 48Ca
A. Bakalyarov*, A. Balysh*, A. S. Barabash, P. Benes+, Ch. Briançon
 , V. Brudanin , P. Cermák+, 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, I. Stekl+, V. V. Timkin, I. E. Veleshko*, Ts. Vylov, V. I. Umatov
*RRC Kurchatov Institute, Kurchatov Square, 123182 Moscow, Russia Institute of Theoretical and Experimental Physics, 117259 Moscow, Russia +FNSPE, Czech Technical University, 11519 Prague, Czech Republic Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, IN2P3-CNRS et UniversitéParis-Sud, 91405 Orsay, FranceJoint Institute for Nuclear Research, 141980 Dubna, RussiaCentre d'Études Nucléaires, IN2P3-CNRS et Universitéde Bordeaux, F-33170 Gradignan, France
PACS: 23.40.-s
Abstract
New limits on 48Ca β- 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, 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. |