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25Mg(p, γ)26Al实验研究进展

  • 摘要: 长寿命放射性核素26Al是星际介质、\gamma射线天文学和太阳系形成研究中最重要的核素之一。最可能合成26Al的三种天体场所都与25Mg(\rm p,\,\rm\gamma )26Al反应相关,因此精确测量其近阈能级的共振强度和天体物理反应率对人们认识宇宙26Al的来源具有重要意义。本文回顾了25Mg(\rm p,\,\rm\gamma )26Al反应的实验研究方法和最新研究进展,特别是介绍了我国对该反应的间接测量实验以及直接实验测量计划。当前的间接测量结果提升了25Mg(\rm p,\,\rm\gamma )26Al天体物理反应率的精度,也可以帮助我们估算直接测量的产额,并优化深地直接测量的实验设计。高能点的直接测量结果与国际上其它实验结果在误差范围内符合很好,表明本项目研制的探测装置工作状态良好,能够胜任锦屏深地核天体物理实验研究。

     

    Abstract: The long-lived radionuclide 26Al is one of the most important nuclide in the study of interstellar medium, \gamma-ray astronomy and the formation of the solar system. The three celestial sites most likely to synthesize 26Al are related to the 25Mg (\rm p,\,\rm\gamma )26Al reaction, therefor the accurate measurement of the near-threshold level resonant strength and astrophysical reaction rates is of great significance to understand the origin of 26Al in the universe. This article reviews the experimental research methods and the recent progress in the 25Mg (\rm p,\,\rm\gamma )26Al experiment. Especially, the indirect measurement and direct measurement plan for this reaction in China is introduced. The current indirect measurement results have improved the experimental accuracy of the 25Mg (\rm p,\,\rm\gamma )26Al astrophysics reaction rates, which can help us estimate the yield of direct measurement and optimize the experimental design. The direct measurement results of high-energy level resonance are in good agreement with the existing experiments within the error bars, indicating that the designed detection system by this project is in good working condition and can be competent for the experiment of Jinping deep underground nuclear astrophysics.

     

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