[Zurück]

C. Domingo-Pardo, U. Abbondanno, G. Badurek, E. Jericha, H. Leeb, H. Oberhummer, -. nTOF Collaboration:
"Resonance capture cross section of ²⁰⁷Pb";
Physical Review C, 74 (2006), S. 055802-1 - 055802-6.

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.

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