High resolution neutron capture and transmission measurements on 137Ba and their impact on the interpretation of meteoric barium anomalies

Details High resolution neutron capture and transmission measurements on 137Ba and their impact on the interpretation of meteoric barium anomalies High resolution neutron capture and transmission measurements on 137Ba and their impact on the interpretation of meteoric barium anomalies

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998phrvc..57.1558k&link_type=abstract

Physical Review C (Nuclear Physics), Volume 57, Issue 4, April 1998, pp.R1558-R1561

Physics

Nuclear Physics

5

Hydrostatic Stellar Nucleosynthesis, Radiative Capture, 90<=A<=149, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages

Scientific paper

We have made improved measurements of the neutron capture and total cross sections for 137Ba over a sufficiently wide range of energies so that the reaction rate at s-process temperatures (kT=6-23 keV) can be determined solely from the data. These rates are crucial for the interpretation of recently discovered anomalies of Ba isotopes in silicon carbide grains from the Murchison meteorite. Recent stellar models of the s process are in agreement with the meteoric anomaly data for Ba only if the 137Ba(n,γ) reaction rate is 20% larger than the previously accepted rate. Our reaction rates at s-process temperatures are in agreement with the extrapolated reaction rate from the most recent previous measurement. Hence, our results uphold, and place on much firmer footing, the discrepancy between recent stellar models of the s-process and the meteoric anomaly data.

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