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First measurement of the partial widths of ²⁰⁹Bi decay to the ground and to the first excited states

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arxiv 1110.3138 v1 pith:7W7TYUWF submitted 2011-10-14 nucl-ex

First measurement of the partial widths of ²⁰⁹Bi decay to the ground and to the first excited states

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keywords firstdecayexcitedgroundground-statealphabeenbolometer
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$^{209}$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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