恒星中Hoyle态的对衰变宽度和碳的产生
Pair decay width of the Hoyle state and carbon production in stars
摘要：
在S-DALINAC上进行了12 C中第一激发态0+（Hoyle态）的电子散射实验。新的数据与一种新的模型无关的分析，世界数据集涵盖了广泛的动量转移范围，导致在一个高度改善的过渡电荷密度，从一个对衰变宽度伽玛_π =（62.3 +- 2.0）micro-eV的霍伊尔状态被提取，减少文献值的不确定性的三个以上的因素。伽玛_π的精确知识是强制性的定量研究中的一些关键问题的建模超新星和渐近巨星分支星，最有可能的网站的慢中子核合成过程。
英文摘要：
Electron scattering off the first excited 0+ state in 12C (the Hoyle state) has been performed at low momentum transfers at the S-DALINAC. The new data together with a novel model-independent analysis of the world data set covering a wide momentum transfer range result in a highly improved transition charge density from which a pair decay width Gamma_pi = (62.3 +- 2.0) micro-eV of the Hoyle state was extracted reducing the uncertainty of the literature values by more than a factor of three. A precise knowledge of Gamma_pi is mandatory for quantitative studies of some key issues in the modeling of supernovae and of asymptotic giant branch stars, the most likely site of the slow-neutron nucleosynthesis process.
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