首页> 外文会议>Symposium on Nuclear Data; 20031127-20031128; Jaeri; JP >Neutron- and Proton-Induced Nuclear Data Evaluation of Thorium, Uranium and Curium isotopes for Energies up to 250 MeV
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Neutron- and Proton-Induced Nuclear Data Evaluation of Thorium, Uranium and Curium isotopes for Energies up to 250 MeV

机译:tron,铀和-同位素的中子和质子诱导核数据评估高达250 MeV的能量

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摘要

The evaluation of neutron- and proton nuclear data for thorium-232, U-233,234,236, and Cm-243,244,245,246 isotopes have been performed at energies up to 250 MeV. Neutron data was evaluated at energies from 20 MeV to 250 MeV, and combined with the JENDL-3.3 data at 20 MeV, while proton data was obtained for energies from 1 to 250 MeV. Nuclear model parameters are largely based on the IAEA-RIPL recommendation, and adjusted to better reproduce the available measurements. The coupled channel optical model was applied to calculate the total, reaction, elastic, and direct inelastic cross sections, and to obtain the transmission coefficients. Decay of excited nuclei was described with the Hauser-Feshbach and exciton models using the GNASH code to simultaneously handle neutron, proton, deuteron, triton, helium-3, α, γ emissions and fissions. Special attention was paid on the fission cross sections for energies where experimental data are scant, using appropriate systematics and fittings. Particles and γ emission spectra after fission were calculated based on the the statistical approach of Fong, and adjusted to the experimental data using the ALICE-ASH code.
机译:at-232,U-233,234,236和Cm-243,244,245,246同位素的中子和质子核数据的评估已在高达250 MeV的能量下进行。在20 MeV至250 MeV的能量下评估中子数据,并与20 MeV的JENDL-3.3数据合并,而从1到250 MeV的能量获得质子数据。核模型参数主要基于IAEA-RIPL建议,并进行了调整以更好地再现可用的测量结果。应用耦合通道光学模型计算总,反应,弹性和直接非弹性横截面,并获得透射系数。 Hauser-Feshbach模型和激子模型使用GNASH代码描述了激发核的衰变,该模型使用GNASH代码同时处理中子,质子,氘核,三核,氦3,α,γ发射和裂变。使用适当的系统和配件,在缺乏实验数据的情况下,特别关注能量的裂变截面。裂变后的粒子和γ发射光谱是根据Fong的统计方法计算的,并使用ALICE-ASH代码将其调整为实验数据。

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