Review Article

Neutrinoless Double-Beta Decay

Table 4

Relevant parameters and features of the “magnificent nine” double-beta decay candidates.

Double-beta candidate -value 
(MeV)
Phase space 
(y−1)
Isotopic abundance
(%)
Enrichable by centrifugation Indicative cost normalized to Ge

Ca 4.27226 (404) 0.187 No
Ge 2.03904 (16) 7.8 Yes 1
Se 2.99512 (201) 9.2 Yes 1
Zr 3.35037 (289) 2.8 No
Mo 3.03440 (17) 9.6 Yes 1
Cd 2.81350 (13) 7.5 Yes 3
Te 2.52697 (23) 33.8 Yes 0.2
Xe 2.45783 (37) 8.9 Yes 0.1
Nd 3.37138 (20) 5.6 No