Capture of Cold Neutrons by ^208Pb

Details Capture of Cold Neutrons by ^208Pb Capture of Cold Neutrons by ^208Pb

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aps..dnp..b414b&link_type=abstract

American Physical Society, Division of Nuclear Physics Meeting, October 28-31, 1998 Santa Fe, New Mexico, abstract #B4.14

Physics

Nuclear Physics

Scientific paper

The doubly-magic nucleus ^208Pb has one of the smallest neutron capture cross sections of any stable isotope. The ^208Pb(n,γ)^209Pb reaction is the endpoint of the astrophysical s-process, and its rate influences the nucleosynthesis of the lead and bismuth isotopes. The only published experiments on the ^208Pb+n system are resonant measurements, but the non-resonant cross section is predicted to contribute significantly to the reaction rate at astrophysical energies.(T. Rauscher et al)., Phys. Rev. C57 (1998) 2031. We have measured the total ^208Pb(n,γ)^209Pb cross section using a cold neutron beam (T_n≈20 K) at the NIST Center for Neutron Research. A highly-enriched (>99%) ^208Pb sample was used, and gamma rays were detected using the Prompt-Gamma Activation Analysis Spectrometer. We have found the total cross section for the ^208Pb(n,γ)^209Pb reaction to be substantially smaller than previously reported.(J. F. Emery, ORNL Rep. 4343) (1969) 71. These results and the prognosis for future measurements at higher neutron energies will be discussed.

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