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首页> 外文期刊>Physics of atomic nuclei >Nuclear level densities in ~(208)Bi and ~(209)Po from the neutron spectra in the (p, n) reactions on ~(208)Pb and ~(209)Bi nuclei
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Nuclear level densities in ~(208)Bi and ~(209)Po from the neutron spectra in the (p, n) reactions on ~(208)Pb and ~(209)Bi nuclei

机译：从〜（208）Pb和〜（209）Bi核的（p，n）反应中子光谱获得的〜（208）Bi和〜（209）Po的核能级密度

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摘要

The spectra of neutrons from the (p, n) reactions on the ~(208)Pb and ~(209)Bi nuclei were measured in the proton-energy range 8-11 MeV. These measurements were performed by using a time-of-flight spectrometer of fast neutrons on the basis of the pulsed tandem accelerator EGP-15 of the Institute of Physics and Power Engineering (Obninsk, Russian Federation). A high resolution and stability of the time-of-flight spectrometermade it possible to identify reliably low-lying discrete levels alongwith the continuum section of the neutron spectra. The measured data were analyzed on the basis of the statistical equilibrium and preequilibrium models of nuclear reactions. The respective calculations were performed by using the precise formalism of Hauser-Feshbach statistical theory together with the generalizedmodel of a superfluid nucleus and the back-shifted Fermi gas model for the nuclear-level density. The nuclear-level densities in ~(208)Bi and ~(209)Po were determined along with their energy dependences and model parameters. Our results are discussed together with available experimental data and recommendations of model systematics.
机译：在质子能量范围为8-11 MeV的条件下，对〜（208）Pb和〜（209）Bi核的（p，n）反应中子的光谱进行了测量。这些测量是根据物理和动力工程研究所（俄罗斯联邦奥布宁斯克）的脉冲串联加速器EGP-15使用快速中子飞行时间光谱仪进行的。飞行时间光谱仪具有高分辨率和稳定性，可以可靠地识别低层离散水平以及中子光谱的连续部分。在核反应的统计平衡和平衡前模型的基础上对实测数据进行了分析。通过使用Hauser-Feshbach统计理论的精确形式，超流体核的广义模型和核水平密度的后移费米气体模型，分别进行了计算。确定了〜（208）Bi和〜（209）Po中的核能级密度以及它们的能量依赖性和模型参数。我们的结果与可用的实验数据以及模型系统学的建议一起进行了讨论。

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