Journal article Open Access

Weak decay of 130 Ba and 132 Ba : Geochemical measurements

Meshik, A. P.; Hohenberg, C. M.; Pravdivtseva, O. V.; Kapusta, Y.-A. S.

The half-life of 130Ba due to multichannel weak decay (2β+, 2EC, and ECβ+) has been determined for the first time by the measurement of the 130Xe daughter accumulated in natural barite (BaSO4) from the Belorechenskoe deposit in North Caucasus, Russia. The accumulation time was determined from U-Xe and K-Ar gas-retention ages measured in the same material, yielding a half-life for 130Ba for all weak decay modes of 2.2±0.5×1021yr (68% C.L.), about a factor of 2 lower than that predicted by the proton-neutron quasiparticle random phase approximation. From excess 132Xe observed in this barite, the half-life for weak decay of 132Ba can be estimated (T1/2=1.3±0.9×1021yr). However, this value is more tentative, since other sources of this isotope cannot be excluded, but the lower limit of 2.2×1021yr remains firm.

Files (69.5 kB)
Name Size
article.pdf
md5:8afbb5f36c3c98282e9d7108b6f387c5
69.5 kB Download
96
41
views
downloads
Views 96
Downloads 41
Data volume 2.8 MB
Unique views 95
Unique downloads 40

Share

Cite as