• Rapid Communication

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

P. E. Koehler, R. R. Spencer, K. H. Guber, R. R. Winters, S. Raman, J. A. Harvey, N. W. Hill, J. C. Blackmon, D. W. Bardayan, D. C. Larson, T. A. Lewis, D. E. Pierce, and M. S. Smith
Phys. Rev. C 57, R1558(R) – Published 1 April 1998
PDFExport Citation

Abstract

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.

  • Received 1 December 1997

DOI:https://doi.org/10.1103/PhysRevC.57.R1558

©1998 American Physical Society

Authors & Affiliations

P. E. Koehler, R. R. Spencer, K. H. Guber, R. R. Winters*, S. Raman, J. A. Harvey, N. W. Hill, J. C. Blackmon, D. W. Bardayan, D. C. Larson, T. A. Lewis, D. E. Pierce, and M. S. Smith

  • Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6354

  • *Permanent address: Physics Department, Denison University, Granville, Ohio 43023.
  • Also at: A.W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511.

References (Subscription Required)

Click to Expand
Issue

Vol. 57, Iss. 4 — April 1998

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review C

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×