Abstract
The dipole strength of 206Pb was studied below the neutron separation energy using photon scattering experiments at the HIGS facility. Utilizing the technique of nuclear resonance fluorescence with 100% linearly-polarized photon beams, the spins, parities, branching ratios and decay widths of excited states in 206Pb from 4.9 - 8.1 MeV have been measured. The new experimental information is used to reliably predict the neutron capture cross section of 205Pb, an important branch point nucleus along the s-process path of nucleosynthesis.
Highlights
Extinct 205Pb isotopes can be used as powerful cosmochemical tracers in the early solar system [1]
The abundance of 205Pb in the early solar system inferred from carbonaceous chondrites data can be used to assess whether Asymptotic Giant Branch (AGB) stars and massive Wolf-Rayet stars are the most likely sites of the s-process [4,5]
This investigation remains sensitive to the amount of freshly produced s-process material, including the survival of 205Pb in AGB stars [6] through both neutron capture and weak interaction processes
Summary
Extinct 205Pb isotopes can be used as powerful cosmochemical tracers in the early solar system [1]. The dipole strength of 206Pb was studied below the neutron separation energy using photon scattering experiments at the HIGS facility.
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