Physics
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...329..943w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 329, June 15, 1988, p. 943-950.
Physics
32
Capture Effect, Neutron Sources, Nuclear Reactions, Stellar Physics, Cross Sections, Energy Spectra, Least Squares Method, Linear Accelerators, Particle Energy
Scientific paper
The neutron capture cross sections were measured over the neutron energy range 2.5-200 keV of Ne-(20, 22) at the Oak Ridge Electron Linear Accelerator using enriched samples at high pressures. The cross sections, averaged using a Maxwell-Boltzmann distribution weighting function for a range of temperatures thought to be appropriate for the sites of s-process stellar nucleosynthesis, are small. For example, the Maxwellian-averaged Ne-22(n, gamma) cross section for kT = 30 keV derived from the present work is smaller than 0.27 mbarn. This result increases the calculated net neutron production from Ne-22 by reducing the importance of Ne-22(n, gamma) as a neutron poison in s-process calculations. The number of neutrons per Fe-56 seed available for s-process stellar nucleosynthesis appears sufficient to account for the observed abundances of the s-elements for A in the range of 60-90.
Macklin Richard L.
Winters Ronald R.
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