Improved limits on β− and β−β− decays of 48Ca

Average and recommended half-life values for two neutrino double beta decay: upgrade-09

“…At the same time, using an independent analysis, the Moscow part of the Collaboration obtained a value similar to the result of Ref. [12], namely T 1/2 = [1.78 ± 0.01(stat) +0.08 −0.10 (syst)] · 10 21 y [47]. 2) In Ref.…”

Systematics of Evaluated Half-lives of Double-beta Decay

“…In recent years claims have been made for the observation of the 0νdecay mode in 76 Ge [5]. These rather controversial results were widely scrutinized and often rejected by the nuclear physics community [6,7]. However, the 2ν-decay mode has definitely been observed in many isotopes.…”

Beta decays in investigations and searches for rare effects

“…48 Ca can decay through single β decay populating few levels in 48 Sc, however, transition to the 131 keV level is estimated as the most probable with T 1/2 = (2.6 − 7.0) × 10 20 y [15]. The process is not observed yet, and the best experimental limit T 1/2 > 2.5 × 10 20 y [16] is not far from the above theoretical estimations. It should be noted that the second order process -two neutrino 2β decay to 48 Ti -is faster in this case; it is already observed with T 1/2 = 6.4 × 10 19 y [17].…”