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New experimental limits on the alpha decays of lead isotopes

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arxiv 1212.2422 v2 pith:EPU26F6M submitted 2012-12-11 nucl-ex

New experimental limits on the alpha decays of lead isotopes

J. W. Beeman , F. Bellini , L. Cardani , N. Casali , S. Di Domizio , E. Fiorini , L. Gironi , S.S. Nagorny
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S. Nisi F. Orio L. Pattavina G. Pessina G. Piperno S. Pirro E. Previtali C. Rusconi C. Tomei M. Vignati
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For the first time a PbWO4 crystal was grown using ancient Roman lead and it was run as a cryogenic detector. Thanks to the simultaneous and independent read-out of heat and scintillation light, the detector was able to discriminate beta/gamma interactions with respect to alpha particles down to low energies. New more stringent limits on the alpha decays of the lead isotopes are presented. In particular a limit of T_{1/2} > 1.4*10^20 y at a 90% C.L. was evaluated for the alpha decay of 204Pb to 200Hg.

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