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5. The unstable 226Ra (t1/2 = 1600 y) alpha decays to the 1* excited state of nucleus X with branching ratio 6% and alpha decays

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5. The unstable 226Ra (t1/2 = 1600 y) alpha decays to the 1* excited state of nucleus X with branching ratio 6% and alpha decays to the ground state of X with branching ratio 94%. The partial half-life for the first mode transition (the one to the first excited state) is

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