The measurement of the 206Pb(n, γ) cross section and stellar implications

Details The measurement of the 206Pb(n, γ) cross section and stellar implications The measurement of the 206Pb(n, γ) cross section and stellar implications

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jphg...35a4020d&link_type=abstract

Journal of Physics G: Nuclear and Particle Physics, Volume 35, Issue 1, pp. 014020 (2008).

Physics

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Scientific paper

The neutron capture cross section of 206Pb has been measured at the CERN n\TOF spectrometer using a setup of two C6D6 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 206Pb 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 206Pb is dominated by α-back decays of short-lived transbismuth isotopes.

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