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VOLUME 76 | ISSUE 9 | PAGE 643
Improved limits on β- and β-β- decays of 48Ca
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.