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Constraining Neutron Capture Cross Sections for Unstable Nuclei with Surrogate Reaction Data and Theory

机译:用替代反应数据和理论约束不稳定核的中子俘获截面

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摘要

Obtaining reliable data for nuclear reactions on unstable isotopes remains an extremely important task and a formidable challenge. Neutron capture cross sections-crucial ingredients for models of astrophysical processes, national security applications, and simulations of nuclear energy generation-are particularly elusive, as both projectile and target in the reaction are unstable. We demonstrate a new method for determining cross sections for neutron capture on unstable isotopes, using Y-87(n,gamma) as a prototype. To validate the method, a benchmark experiment is carried out to obtain the known Zr-90(n,gamma) cross section analogously. Our approach, which employs an indirect ("surrogate") measurement combined with theory, can be generalized to a larger class of nuclear reactions. It can be used both with traditional stable-beam experiments and in inverse kinematics at rare-isotope facilities.
机译:获得关于不稳定同位素的核反应的可靠数据仍然是极其重要的任务,也是一个艰巨的挑战。中子俘获横截面-天体过程模型,国家安全应用和核能发电模拟的关键要素-尤其难以捉摸,因为弹丸和反应中的目标都是不稳定的。我们演示了一种使用Y-87(n,γ)作为原型来确定不稳定同位素中子俘获截面的新方法。为了验证该方法,进行了基准实验,以类似方式获得已知的Zr-90(n,γ)截面。我们的方法结合了理论的间接(“替代”)测量方法,可以推广到更大范围的核反应。它既可以与传统的稳定光束实验一起使用,也可以在稀有同位素设施的逆运动学中使用。

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  • 来源
    《Physical review letters》 |2018年第5期|052501.1-052501.7|共7页
  • 作者单位

    Lawrence Livermore Natl Lab, Nucl & Chem Sci Div, Livermore, CA 94551 USA;

    Lawrence Livermore Natl Lab, Nucl & Chem Sci Div, Livermore, CA 94551 USA;

    Lawrence Livermore Natl Lab, Nucl & Chem Sci Div, Livermore, CA 94551 USA;

    Lawrence Livermore Natl Lab, Nucl & Chem Sci Div, Livermore, CA 94551 USA;

    Lawrence Livermore Natl Lab, Nucl & Chem Sci Div, Livermore, CA 94551 USA;

    Texas A&M Univ, Inst Cyclotron, College Stn, TX 77840 USA;

    Texas A&M Univ, Inst Cyclotron, College Stn, TX 77840 USA;

    Texas A&M Univ, Inst Cyclotron, College Stn, TX 77840 USA;

    Univ Richmond, Dept Phys, Richmond, VA 23173 USA;

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  • 正文语种 eng
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