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arXiv · 1110.3138

First measurement of the partial widths of $^{209}$Bi decay to the ground and to the first excited states

J. W. Beeman·M. Biassoni·C. Brofferio·C. Bucci·S. Capelli·L. Cardani·M. Carrettoni·M. Clemenza·O. Cremonesi·E. Ferri·A. Giachero·L. Gironi·P. Gorla·C. Gotti·C. Maiano·A. Nucciotti·L. Pattavina·M. Pavan·G. Pessina·S. Pirro·E. Previtali·M. Sisti·L. Zanotti
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Abstract

$^{209}$Bi alpha decay to the ground and to the first excited state have been contemporary observed for the first time with a large BGO scintillating bolometer. The half-life of $^{209}$Bi is determined to be $\tau_{1/2}$=(2.01$\pm$0.08)$\cdot10^{19}$ years while the branching ratio for the ground-state to ground-state transition is (98.8$\pm$0.3)%.

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J. W. Beeman, M. Biassoni, C. Brofferio, C. Bucci, S. Capelli, L. Cardani, M. Carrettoni, M. Clemenza, O. Cremonesi, E. Ferri, A. Giachero, L. Gironi, P. Gorla, C. Gotti, C. Maiano, A. Nucciotti, L. Pattavina, M. Pavan, G. Pessina, S. Pirro, E. Previtali, M. Sisti, L. Zanotti. 2011-10-14. First measurement of the partial widths of $^{209}$Bi decay to the ground and to the first excited states. https://doi.org/10.1103/physrevlett.108.062501

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