C. Domingo-Pardo, U. Abbondanno, G. Badurek, E. Jericha, H. Leeb, H. Oberhummer, -. nTOF Collaboration:
"Measurement of the neutron capture cross section of the s-only isotope 204Pb from 1 eV to 440 keV";
Physical Review C,
The neutron capture cross section of 204Pb has been measured at the CERN n TOF installation with high
resolution in the energy range from 1 eV to 440 keV. An R-matrix analysis of the resolved resonance region,
between 1 eV and 100 keV, was carried out using the SAMMY code. In the interval between 100 keV and
440 keV we report the average capture cross section. The background in the entire neutron energy range was
reliably determined from the measurement of a 208Pb sample. Other systematic effects in this measurement were
investigated and precisely corrected by means of detailed Monte Carlo simulations. We obtain a Maxwellian
average capture cross section for 204Pb at kT = 30 keV of 79(3) mb, in agreement with previous experiments.
However our cross section at kT = 5 keV is about 35% larger than the values reported so far. The implications
of the new cross section for the s-process abundance contributions in the Pb/Bi region are discussed.
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