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Lifetime measurements of 214Po and 212Po with the CTF liquid scintillator detector at LNGS

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arxiv 1212.1332 v2 pith:ENW6MD4X submitted 2012-12-06 nucl-ex hep-phnucl-thphysics.ins-det

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
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F. Calaprice C. Carraro P. Cavalcante A. Chavarria A. Chepurnov V. Chubakov D. D'Angelo S. Davini A. Derbin A. Etenko K. Fomenko D. Franco C. Galbiati S. Gazzana C. Ghiano M. Giammarchi M. G\"oger-Neff A. Goretti L. Grandi E. Guardincerri S. Hardy Aldo Ianni Andrea Ianni V. Kobychev D. Korablev G. Korga Y. Koshio D. Kryn M. Laubenstein T. Lewke Marcello Lissia E. Litvinovich B. Loer F. Lombardi P. Lombardi L. Ludhova I. Machulin S. Manecki W. Maneschg G. Manuzio Q. Meindl E. Meroni L. Miramonti M. Misiaszek D. Montanari P. Mosteiro F. Mantovani V. Muratova S. Nisi L. Oberauer M. Obolensky F. Ortica K. Otis M. Pallavicini L. Papp L. Perasso S. Perasso A. Pocar G. Ranucci A. Razeto A. Re A. Romani N. Rossi A. Sabelnikov R. Saldanha C. Salvo S. Sch\"onert H. Simgen M. Skorokhvatov O. Smirnov A. Sotnikov S. Sukhotin Y. Suvorov R. Tartaglia G. Testera R.B. Vogelaar F. von Feilitzsch J. Winter M. Wojcik A. Wright M. Wurm G. Xhixha J. Xu O. Zaimidoroga S. Zavatarelli G. Zuzel
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classification nucl-ex hep-phnucl-thphysics.ins-det
keywords decayslifetimemeasurementsstatsystalphabetacoincidence
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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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