Neutron capture cross section of Au-197: A standard for stellar nucleosynthesis
Neutron capture cross section of Au-197: A standard for stellar nucleosynthesis
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Au-197 的中子捕获截面：恒星核合成的标准
DOI：
10.1103/physrevc.37.595
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发表时间：
1988
影响因子：
3.1
通讯作者：
F. Käppeler
中科院分区：
文献类型：
--
作者：
W. Ratyński;F. Käppeler
利用产生中子的{Li}(p，n)Be反应，测量了金的中子俘获截面。该反应不仅可以通过靶的活度提供积分的中子通量，还可以模拟KT=25keV的麦克斯韦中子能谱。由于该光谱是在打开角度为120°的前向锥体中发射的，因此可以在良好的几何形状下测量截面，而不受任何其他标准的影响。通过实验研究了一系列激活过程中的系统不确定度。在KT=25keV时，最终的恒星截面为648ifmmodePmElseTextPmFI=10mb，由共同的S过程温度KT=30keV外推得到582ifmmodePmElseTextPmFI9mb。这一结果被用来重整化一些已经测量的相对于金的横截面。
We have measured the neutron capture cross section of gold using the $^{7}\mathrm{Li}$(p,n${)}^{7}$Be reaction for neutron production. This reaction not only provides the integrated neutron flux via the $^{7}\mathrm{Be}$ activity of the target, but also allows for the simulation of a Maxwellian neutron energy spectrum at kT=25 keV. As this spectrum is emitted in a forward cone of 120\ifmmode^\circ\else\textdegree\fi{} opening angle, the cross section can be measured in good geometry and independent of any other standard. Systematic uncertainties were studied experimentally in a series of activations. The final stellar cross section at kT=25 keV was found to be 648\ifmmode\pm\else\textpm\fi{}10 mb, and extrapolation to the common s-process temperature kT=30 keV yields 582\ifmmode\pm\else\textpm\fi{}9 mb. This result is used for renormalization of a number of cross sections which had been measured relative to gold.