Resonance capture cross section of 207Pb

Abstract

The radiative neutron capture cross section of 207Pb has been measured at the CERN neutron time of flight installation n_TOF using the pulse height weighting technique in the resolved energy region. The measurement has been performed with an optimized setup of two C6D6 scintillation detectors, which allowed us to reduce scattered neutron backgrounds down to a negligible level. Resonance parameters and radiative kernels have been determined for 16 resonances by means of an R-matrix analysis in the neutron energy range from 3 keV to 320 keV. Good agreement with previous measurements was found at low neutron energies, whereas substantial discrepancies appear beyond 45 keV. With the present results, we obtain an s-process contribution of 77(8)% to the solar abundance of 207Pb. This corresponds to an r-process component of 23(8)%, which is important for deriving the U/Th ages of metal poor halo stars.

arXiv comment7 pages, 3 figures, to be published in Phys. Rev. C

References in corpus (5)

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• Galactic chemical evolution of heavy elements: from Barium to Europium
• R-Process Abundances and Chronometers in Metal-Poor Stars
• Lead: Asymptotic Giant Branch production and Galactic Chemical Evolution
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Cited by in corpus (7)

• The s Process: Nuclear Physics, Stellar Models, Observations
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• Measurement of the neutron capture cross section of the s-only isotope 204Pb from 1 eV to 440 keV
• Measurement of the radiative neutron capture cross section of 206Pb and its astrophysical implications
• Advances and new ideas for neutron-capture astrophysics experiments at CERN n_TOF
• First measurement of the neutron-emission probability with a surrogate reaction in inverse kinematics at a heavy-ion storage ring
• New perspectives for neutron capture measurements in the upgraded CERN-n_TOF Facility