The measurement of the (206)Pb(n,gamma) cross section and stellar implications
- Forschungszentrum Karlsruhe GmbH, Institute fur Kernphysik, Germany
- ORNL
The neutron capture cross section of {sup 206}Pb has been measured at the CERN n/TOF spectrometer using a setup of two C{sub 6}D{sub 6} detectors. In the energy interval from 1 eV to 600 keV the cross section is dominated by resonances, which were analyzed via the R-matrix analysis code SAMMY. In the relevant energy ranges for stellar nucleosynthesis, i.e., at thermal energies of kT = 8 keV and kT = 23 keV, the present Maxwellian average cross section differs by 20% and 9% from the recommended values of Bao et al respectively. From the new cross section the s-abundance of {sup 206}Pb could be reliably determined as 70(4)%. This result is of importance in order to test and constrain r-process abundance calculations in the actinide region, because the r-process portion of {sup 206}Pb is dominated by {alpha}-back decays of short-lived transbismuth isotopes.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 1036683
- Journal Information:
- Journal of Physics G: Nuclear and Particle Physics, Vol. 35, Issue 1; ISSN 0954-3899
- Country of Publication:
- United States
- Language:
- English
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