Measurement of the half-life of the first excited state of 205Pb

Physics – Nuclear Physics

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Lifetimes, Gamma Transitions And Level Energies, 190<=A<=219, Elementary Particle Processes

Scientific paper

The inverse β decay 205Tl(ν,e)205Pb can be used to investigate the solar neutrino flux averaged over the last several million years. The inverse β decay proceeds dominantly via the 2.3 keV level of the 205Pb and an accurate estimate of the cross section depends on our knowledge of the structure of the 2.3 keV level. We have made the first measurement of the half-life for the decay of the 2.3 keV level to the 205Pb ground state. Our result is T1/2=24.2+/-0.4 μs and can be used to improve our knowledge of the structure of the two 205Pb states.

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