A. Kawashima et al., GEOCHEMICAL ESTIMATION OF THE HALF-LIFE FOR THE DOUBLE BETA-DECAY OF ZR-96, Physical review. C. Nuclear physics, 47(6), 1993, pp. 2452-2456
An excess amount of Mo-96 found in a 1.7 x 10(9) yr zircon sample from
Cable Sands' Western Australia, yielded a half-life of (3.9+/-0.9) X
10(19) yr for the double beta decay of Zr-96 to Mo-96.