弱s过程的中子俘获截面
Neutron Capture Cross Sections for the Weak s Process
摘要：
在过去的几十年里，人们对热脉冲渐近巨星分支（AGB）恒星中主要的s过程成分的理解取得了很大进展。在这个过程中，大约一半的重元素，主要在90<=A<=209之间被合成。改进了恒星模型以及测量相关的核数据，以便更好地描述主s过程。在大质量恒星（M>= 8 M太阳）中，弱s过程有助于产生质量范围为56<=A<=90的较轻核，但人们对它的了解要少得多。更好地描述弱s分量将有助于理清这一区域元素生产的各种贡献。为此目的，在FZK的3.7 MV Van de Graaff加速器上用活化法对中等质量核进行了中子俘获截面的一系列测量。此外，中子俘获大量A<56的轻元素对s-过程核合成起着重要作用，因为它们充当中子毒物并影响恒星中子平衡。新的结果提出的（n，g）截面的41 K和45 Sc，和修订的截面的基础上改进的光谱信息。
英文摘要：
In past decades a lot of progress has been made towards understanding the main s-process component that takes place in thermally pulsing Asymptotic Giant Branch (AGB) stars. During this process about half of the heavy elements, mainly between 90<=A<=209 are synthesized. Improvements were made in stellar modeling as well as in measuring relevant nuclear data for a better description of the main s process. The weak s process, which contributes to the production of lighter nuclei in the mass range 56<=A<=90 operates in massive stars (M>=8Msolar) and is much less understood. A better characterization of the weak s component would help disentangle the various contributions to element production in this region. For this purpose, a series of measurements of neutron-capture cross sections have been performed on medium-mass nuclei at the 3.7-MV Van de Graaff accelerator at FZK using the activation method. Also, neutron captures on abundant light elements with A<56 play an important role for s-process nucleosynthesis, since they act as neutron poisons and affect the stellar neutron balance. New results are presented for the (n,g) cross sections of 41K and 45Sc, and revisions are reported for a number of cross sections based on improved spectroscopic information.
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