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

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..dnp..id06k&link_type=abstract

American Physical Society, Division of Nuclear Physics Meeting, October 5-8, 1997, abstract #ID.06

Physics

Nuclear Physics

Scientific paper

Recent models of the s process occurring in low-mass Asymptotic Giant Branch (AGB) stars have succeeded in reproducing the isotopic anomalies measured in certain meteorites for all the barium isotopes except ^137Ba. The disagreement for ^137Ba may be due to a problem with the ^137Ba(n,γ ) reaction rate used in the calculations because the measurements on which this rate is based had a lower energy limit (E_n=10 keV) which was too high to determine reliably the reaction rate at the low temperatures (kT=6-8 keV) needed by the new AGB s-process models. We have addressed this problem by making new high resolution (n,γ ) and transmission measurements on an isotopically enriched sample of ^137Ba at the ORELA for a range of energies (100 eV to 280 keV) which is broad enough to allow an accurate determination of the reaction rate at the temperatures needed by the new AGB s-process models. We will discuss the impact of our new data on the interpretation of the meteoric barium anomalies.

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