Neutron capture cross sections of the cerium isotopes for s- and p-process studies

Details Neutron capture cross sections of the cerium isotopes for s- and p-process studies Neutron capture cross sections of the cerium isotopes for s- and p-process studies

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996phrvc..53.1397k&link_type=abstract

Physical Review C (Nuclear Physics), Volume 53, Issue 3, March 1996, pp.1397-1408

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14

Radiative Capture, Hydrostatic Stellar Nucleosynthesis, Nucleosynthesis In Novae, Supernovae, And Other Explosive Environments, 90<=A<=149

Scientific paper

The neutron capture cross sections of the stable cerium isotopes 136, 138, 140, and 142 have been measured relative to that of gold by means of the activation method. The samples were irradiated in a quasistellar neutron spectrum for kT=25 keV using the 7Li(p,n)7Be reaction near threshold. Variation of the experimental conditions in different activations and the use of different samples allowed for the reliable determination of corrections and the evaluation of systematic uncertainties. The resulting stellar cross sections can be given with uncertainties between 3% and 7%. The present data for 136Ce and 138Ce are the first experimental information in this mass region of relevance for p-process studies to our knowledge, whereas the new 142Ce cross section allowed to resolve a previous discrepancy. The experimental results are complemented by a set of calculated cross sections for all cerium isotopes from 132Ce to 142Ce as well as for 141Pr, 142Pr, and 143Pr. The improved cross sections were used in an updated s-process analysis of the Ce-Pr-Nd region that included the small branchings at 141Ce and 142Pr. The consequences of the resulting s abundances are discussed with respect to isotopic anomalies in meteoritic neodymium as well as for the r- and p-process residuals.

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