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首页> 外文会议>International Conference on Nuclear Data for Science and Technology >High-Resolution Neutron Capture and Total Cross Section Measurements for ~(192,194,195,196)Pt and the Astrophysical Rates for the ~(192,194,195,196)Pt(n,γ) Reactions
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High-Resolution Neutron Capture and Total Cross Section Measurements for ~(192,194,195,196)Pt and the Astrophysical Rates for the ~(192,194,195,196)Pt(n,γ) Reactions

机译：高分高中中子捕获和总横截面测量〜（192,194,195,196）Pt和天体物理率为〜（192,194,195,196）Pt（n，γ）反应

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We have made the first experimental determinations of the astrophysical rates for the ~(192,194,195,196)Pt(n,γ) reactions across the range of temperatures needed for astrophysical models of the s process. Both neutron capture and total cross sections were measured for ~(192,194,195,196)Pt at the Oak Ridge Electron Linear Accelerator (ORELA) from 10 eV to 500 keV. The data were fitted using the R-matrix code SAMMY to obtain resonance parameters. These parameters as well as the measured cross sections in the unresolved region were used to obtain the astrophysical reaction rates for all these isotopes. We compare our results to previous data and theoretical reaction rates and discuss their astrophysical impact. For example, a classical analysis of the s-process branching at ~(192)Ir using our new rates yields a much lower neutron density than previous analyses of other branchings, in agreement with the long-sought freeze-out effect predicted by dynamical (e.g. stellar) models.
机译：我们已经通过STROCHESICE模型的天体物理模型所需的温度范围的〜（192,194,195,196）Pt（n，γ）反应的第一次实验确定。在OAK脊电子线性加速器（ORELA）的〜（192,194,195,196）中测量中子捕获和总横截面，从10eV到500kev。使用R-Matrix代码Sammy拟合数据以获得共振参数。这些参数以及未解决的区域中的测量横截面用于获得所有这些同位素的天体物理反应速率。我们将结果与先前的数据和理论反应率进行比较，并讨论其天体物理影响。例如，使用我们的新速率的〜（192）IR的S-Process分支的经典分析比以前的其他分支分析的中子密度低得多，同时与动态预测的长寻求冻结效果（例如，恒星）模型。

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