Nucleosynthesis at the termination point of the s process

Journal Article · Wed Dec 01 04:00:00 EST 2004 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.70.065803· OSTI ID:20695849

Ratzel, U; Arlandini, C; Kaeppeler, F; Couture, A; Wiescher, M; Reifarth, R; Gallino, R; Mengoni, A; Travaglio, C ^[1]; CERN, CH-1211 Geneva 23 ^[2]

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1. Institut fuer Kernphysik, Forschungszentrum Karlsruhe, P.O. Box 3640, D-76021 Karlsruhe (Germany)
2. Switzerland

Stellar cross sections of importance with respect to the termination of the s-process reaction chain have been determined for the two cases, {sup 208}Pb(n,{gamma}){sup 209}Pb and {sup 209}Bi(n,{gamma}){sup 210}Bi{sup g}, yielding kT=30 keV values of <{sigma}v>/v{sub T}=0.31{+-}0.2 mb and 2.54{+-}0.14 mb, respectively. The measurements were carried out by activation of Pb and Bi samples in a quasistellar neutron spectrum using gold as a cross section standard. With this technique the uncertainties reported in previous works could be considerably reduced. The measurements are complemented by a discussion of the recycling at the termination point of the s-process neutron capture chain in a 3M{sub {center_dot}} and [Fe/H]=-1.3 asymptotic giant branch star. At this metallicity, AGB stars give rise to the maximum production of s-process lead. The sensitivity of the isotopic lead abundances is discussed with respect to the remaining cross section uncertainties. The information obtained in this work is also of relevance for an assessment of the {alpha} activity due to a buildup of {sup 210}Po in Pb/Bi cooled fast reactor systems.

• OSTI ID: 20695849
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 70; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BISMUTH 209 TARGET
CAPTURE
CROSS SECTIONS
ELEMENT ABUNDANCE
KEV RANGE
LEAD 208 TARGET
LEAD 209
NEUTRON REACTIONS
NEUTRON SPECTRA
NUCLEOSYNTHESIS
S PROCESS
SUPERGIANT STARS