Nucleosynthesis at the termination point of the s process
Nucleosynthesis at the termination point of the s process
复制标题
s过程终止点的核合成
DOI：
10.1103/physrevc.70.065803
复制
发表时间：
2004
影响因子：
3.1
通讯作者：
C. Travaglio
中科院分区：
文献类型：
--
作者：
U. Ratzel;C. Arlandini;F. Käppeler;A. Couture;M. Wiescher;R. Reifarth;R. Gallino;A. Mengoni;C. Travaglio
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 /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.
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 /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.