发表机构
University of Surrey; Facility for Rare Isotope Beams, Michigan State University; Department of Physics and Astronomy, Michigan State University; AWE Nuclear Security Technologies（萨里大学; 密歇根州立大学稀有同位素束设施; 密歇根州立大学物理与天文学系; 阿韦核安全技术有限公司）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出区域光学势CHiRP，通过贝叶斯校准锆同位素弹性散射数据，改进复合核反应预测精度，降低不确定性，优于全局势CHUQ。
AI 中文摘要
具有不确定性量化的全局光学势参数化对于跨核素图进行系统性研究以及远离稳定线的预测非常有用。尽管它们通常能很好地描述用于校准的反应，但在特定情况下预测可能严重偏离，且外推会带来很大的不确定性。我们提出了一种适用于核景观特定区域的区域光学势。我们沿同位素链校准该势，以实现强大的数据覆盖和改进的外推能力。我们修改了Chapel Hill光学势以及Pruitt等人先前使用的统计模型，以对锆同位素的中子和质子弹性散射进行贝叶斯分析，并改进数据覆盖。我们的Chapel Hill区域势（CHiRP）的参数分布被传播到复合核反应观测量，包括(n, n')、(n, g)和(n, 2n)，这些与各种核技术应用相关。结果与CHUQ（Chapel Hill势的全局校准）进行了比较。CHiRP的最终参数化在虚部的能量和径向依赖性方面与CHUQ尤其不同。对于弹性散射，使用CHiRP的观测量不确定性小于使用CHUQ的不确定性。CHiRP在约10 MeV能量下与数据的一致性也优于其全局对应物，而在更高能量下，区域和全局方法对弹性数据的一致性水平相似。还报告了CHiRP和CHUQ在通过复合核反应通道传播其不确定性时的相对性能。对于需要在核景观子区域内获得精确信息的应用，区域势方法是全局光学模型参数化的可行替代方案。
英文摘要
Uncertainty-quantified global optical potential parameterizations are useful for making systematic studies across the nuclear chart and making predictions away from stability. While they generally provide a good description of the reactions on which they were calibrated, predictions can deviate strongly in specific cases and extrapolations incur large uncertainties. We propose a regional optical potential suited for a specific region of the nuclear landscape. We calibrate the potential along isotopic chains to enable both strong data coverage and improved extrapolative power. We modify the Chapel Hill optical potential and the statistical model used previously by Pruitt et al., to perform a Bayesian analysis of elastic scattering of neutrons and protons from zirconium isotopes with improved data coverage. The parameter distributions of our Chapel Hill Regional Potential (CHiRP) are propagated to compound nucleus reaction observables including (n, n'), (n, g) and (n, 2n), which have relevance to various nuclear technology applications. Results are compared to CHUQ, a global calibration of the Chapel Hill potential. The final parameterization of CHiRP differs from CHUQ particularly in the energy and radial dependence of its imaginary components. For elastic scattering, the uncertainties on the observables using CHiRP are smaller than those using CHUQ. CHiRP also provides an improvement over its global counterpart in the agreement with data around 10 MeV, while the regional and global approaches offer similar levels of agreement to elastic data at higher energies. The relative performance of CHiRP and CHUQ when propagating their uncertainty through compound nucleus reaction channels is also reported. The regional potential approach is a viable alternative to global optical model parameterizations for applications that require precise information within a sub-region of the nuclear landscape.
