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

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 th...

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Bibliographic Details
Published in:Journal of physics. G, Nuclear and particle physics Nuclear and particle physics, 2008-01, Vol.35 (1)
Main Authors: Domingo-Pardo, C., Koehler, Paul Edward, N_TOF collaboration
Format: Article
Language:English
Subjects:
ABUNDANCE
ACTINIDES
CAPTURE
CERN
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CROSS SECTIONS
ENERGY RANGE
NEUTRON REACTIONS
NUCLEAR PHYSICS AND RADIATION PHYSICS
NUCLEOSYNTHESIS
R MATRIX
R PROCESS
SPECTROMETERS
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Summary: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.
ISSN:0954-3899
1361-6471
DOI:10.1088/0954-3899/35/1/014020