{sup 134,136}Ba(n,{gamma}) cross sections for s-process studies
- Oak Ridge National Laboratory, TN (United States); and others
The isotopes of barium play a vital role in s-process nucleosynthesis; hence an accurate determination of their (n,{gamma}) cross sections is very important for a better understanding of the s-process. A recent measurements of {sup 134,136}Ba(n,{gamma}) cross sections yielded an astrophysical reaction rate significantly different from the previously accepted value. Furthermore, substantial uncertainties remain in the reaction rate at the low temperatures (kT{approx}12 keV) favored by recent stellar models, because neither of the previous measurements extended to sufficiently low neutron energies. We have recently completed measurements of the {sup 134,136}Ba(n,{gamma}) cross sections from approximately 20 eV to 100 keV. These data, together with our concurrent measurements of the total cross sections for these nuclei, should result in a much more accurate determination of the astrophysical reaction rates near kT=12 keV. The measurements were performed at the Oak Ridge Electron Linear Accelerator (ORELA) using our recently improved C{sub 6}D{sub 6} detector apparatus. We will describe the experiment and report on the results and their impact on s-process nucleosynthesis models.
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 255573
- Report Number(s):
- CONF-9510116-; ISSN 0003-0503; TRN: 96:015886
- Journal Information:
- Bulletin of the American Physical Society, Vol. 40, Issue 10; Conference: Fall meeting of the Division of Nuclear Physics of the American Physical Society, Bloomington, IN (United States), 25-28 Oct 1995; Other Information: PBD: Oct 1995
- Country of Publication:
- United States
- Language:
- English
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