Lifetime measurements of 214Po and 212Po with the CTF liquid scintillator detector at LNGS
Borexino Collaboration: G. Bellini, J. Benziger, D. Bick, G. Bonfini,, D. Bravo, M. Buizza Avanzini, B. Caccianiga, L. Cadonati, F. Calaprice, C., Carraro, P. Cavalcante, A. Chavarria, A. Chepurnov, V. Chubakov, D. D'Angelo,, S. Davini, A. Derbin, A. Etenko, K. Fomenko
TL;DR
This study precisely measured the lifetimes of 214Po and 212Po using liquid scintillator detectors at LNGS, improving accuracy and confirming previous results with high signal-to-background ratios.
Contribution
The paper provides more precise lifetime measurements of 214Po and 212Po, reducing uncertainties compared to prior studies.
Findings
214Po lifetime: 236.00 ± 0.42 μs
212Po lifetime: 425.1 ± 0.9 ns
Results are consistent with previous measurements
Abstract
We have studied the alpha decays of 214Po into 210Pb and of 212Po into 208Pb tagged by the coincidence with the preceding beta decays from 214Bi and 212Bi, respectively. The employed 222Rn, 232Th, and 220Rn sources were sealed inside quartz vials and inserted in the Counting Test Facility at the underground Gran Sasso National Laboratory in Italy. We find that the mean lifetime of 214Po is (236.00 +- 0.42(stat) +- 0.15(syst)) \mu s and that of 212Po is (425.1 +- 0.9(stat) +- 1.2(syst)) ns. Our results, obtained from data with signal-to-background ratio larger than 1000, reduce the overall uncertainties and are compatible with previous measurements.
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Taxonomy
TopicsRadioactive Decay and Measurement Techniques · Radioactivity and Radon Measurements · Nuclear Physics and Applications