| C. Domingo-Pardo et al. (G. Aerts, S. Andriamonje, E. Berthoumieux, C. Carrapico, W. Dridi, F. Gunsing, C. Lampoudis, J. Pancin, L. Perrot, A. Plukis) |
The neutron capture cross section of 204 Pb 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 208 Pb
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 204 Pb 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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