质子入射能在Ep≤100MeV的（p，n）反应激发函数半经验计算方法

基于核反应的蒸发模型和预平衡激子模型,在靶核质量数为30≤A≤140、质子入射能Ep≤100 MeV的范围内,假定激子数为N=N_0=3时达到平衡,激子模型采用了“无返回”近似,采用常温型能级密度等条件下,对模型理论进行了简化,得到了理论模型清晰、公式简单的计算(p,n)反应的激发函数的半经验公式,并利用实验数据对半经验公式中的参数进行了研究,得到了该参数与靶核N和Z的     

（p,n）反应激发函数的系统学研究

从普朗克黑体辐射公式和实验测量数据出发，提出了１个包含２个可调参量、入射了能量从阈能到１５０ＭｅＶ、靶核质量数在２０〈Ａ〈２３８范围内能够较好描述（ｐ，ｎ）反应激发函数的学经验公式。     

蒸发和激子模型的(n,α)激发函数系统学研究

(n，α)反应截面对于反应堆，特别是对快堆和聚变堆工程设计是一种很重要的数据。在一些近似条件下，基于核反应蒸发和预平衡激子模型理论研究了入射能量小于20MeV的(n，α)激发函数。在靶核30≤A≤209范围内，基于(n，α)反应的截面实验数据对得到的半经验公式的参数进行了研究，得到了参数对靶核的N和Z以及中子入射能量的依赖关系。利用普适参数预言(n，α)反应的激发函数，预言值在其误差范围内与实验数据一致。     

蒸发和激子模型的(n,a)激发函数系统学研究

(n,a)反应截面对于反应堆,特别是对快堆和聚变堆工程设计是一种很重要的数据。在一些近似条件下,基于核反应蒸发和预平衡激子模型理论研究了入射能量小于 20 MeV的(n,a)激发函数。在靶核30≤A≤209 范围内,基于(n,a)反应的截面实验数据对得到的半经验公式的参数进行了研究,得到了参数对靶核的 N 和 Z 以及中子入射能量的依赖关系。利用普适参数预言(n,a)反应的激发函数,预言值在其误差范围内与实验数据一致。     

(n,2n)和(n,3n)激发函数的计算

本文从入射中子能量为E=14MeV的σ_(n,2n)实验值出发,应用复合核模型,计算了十三种无分支比复合核衰变的非裂变重核(A>169)的(n,2n)、(n,3n)激发函数。与实验激发曲线比较,讨论了计算的合理性和可靠性。     

En〉6MeV能区（n,p）反应截面的物理分析

在Ｅｎ〈６ＭｅＶ能区,以＾５８Ｎｉ（ｎ,ｐ）＾５８Ｃｏ和＾６４Ｚｎ（ｎ,ｐ）＾６４Ｃｕ反应为例,对（ｎ,ｐ）反应堆面的实验数据进行物理分析,得出在评价这段能区的反应堆面时更应重视使用＾６Ｌｉ－ｐ和Ｔ－ｐ中子源实验数据的结论。Ｔ     

14 MeV能区中子引起的58 Ni(n,P)58m+gCo 反应截面测量

用活化法以^27Al(n，α)^24Na反应截面为中子通量标准，对14McV能区中子引起的^58Ni(n,p)^58m gCo反应截面进行了测量。中子能量是用金硅面垒半导体探测器测定的。     

186W(d,p)187W和186W(d,2n)186Re反应激发函数评价及厚靶产额计算

考虑特征γ射线分支比、衰变常量和标准截面等修正,对氘引起的核反应¹⁸⁶W(d,p)¹⁸⁷W和¹⁸⁶W(d,2n)¹⁸⁶Re的激发函数进行了研究。收集并分析了这些反应激发函数的实验测量数据,应用数学方法对分析处理后的实验数据进行了拟合。同时,采用TALYS程序对这些激发函数进行了理论计算。经过综合评价,给出了50 MeV以下¹⁸⁶W(d,p)¹⁸⁷W和¹⁸⁶W(d,2n)¹⁸⁶Re反应激发函数的推荐值,利用得到的¹⁸⁶W(d,2n)¹⁸⁶Re激发函数推荐值计算了医用放射性核素¹⁸⁶Re的厚靶产额。     

Ep≤200 MeV能区p+58Ni反应的计算与分析

以现有质子诱发⁵⁸Ni的各种核反应截面、能谱、双微分截面、弹性散射角分布等实验数据为基础，利用自行研制的大型核模型计算程序MEND计算质子能量在200MeV能区内⁵⁸Ni(p,x)反应的截面、能谱、角分布和n、p、α、d、t、³He6种出射轻粒子的双微分截面。MEND程序的理论框架基于球形光学模型、核子的核内级联发射模型、以激子模型为基础的预平衡发射理论、蒸发模型和带宽度涨落修正的Hauser Feshbach统计理论。光学模型中的势参数由APMN程序通过符合p+⁵⁸Ni反应的去弹截面和弹性散射角分布获得。出射粒子的双微分截面则利用MEND程序输出的能谱再通过Kalbach系统学公式计算。将计算结果与实验数据及ENDF/B6评价库进行了比较，计算结果与实验数据基本一致，与ENDF/B6相比，增加了³He的计算，且将能区上推至200MeV。      

186W(p,n)186Reg的激发函数和厚靶产额的计算

为计算¹⁸⁶W(p,n)¹⁸⁶Re^g反应的激发函数,收集了EXFOR实验数据库中的一些实验数据并对其进行了分析修正。将修正过的实验数据与EMPIRE程序理论计算得到的数据进行了比对,以此来选择合适的光学模型势和能级密度参数,给出了¹⁸⁶W(p,n)¹⁸⁶Re^g反应截面的推荐值。利用得到的激发函数计算了医用放射性核素¹⁸⁶Re^g的厚靶产额,并给出了相应的推荐值。     

Calculations of n ~(141)Pr Reaction in Energy Region up to 20 MeV

A set of neutron optical potential parameters for ~(141)Pr in energy region up to 20 MeV is obtained based on concerned experimental data. Various cross sections, secondary neutron spectra, and elastic scattering angular distributions of n ~(141)Pr reaction are calculated. The calculated results are in good agreement with the experimental data.     

Calculations of n ~(240)pu Reaction in the Energy Region up to 20 MeV

All reaction cross sections, elastic scattering angular distributions, double differential cross sections, and the γ production data of n ~(240)Pu reaction in the energy region up to 20 MeV were calculated. Pretty good theoretical results in accordance with experimental data were obtained and they are comparable with those given by ENDFB-6 and JENDL-3 libraries.     

Calculations of Complete Neutron Data of n ~(239)pu Reaction in the Energy Region up to 20 MeV

A complete set neutron cross sections, elastic scattering angular distributions, double differential cross sections, γ production data as well as the charged particle emission cross sections of n ~(239)pu reaction in the energy region up to 20 MeV were calculated. Pretty good theoretical results in agreement with the experimental data were obtained and they are comparable with those given by ENDFB-6 and JENDL-3 libraries.     

Excitation functions of (n,p) reactions for stable isotopes of Cr,Fe and Ni from threshold to 20 MeV

The excitation functions of (n,p) reactions for the stable isotopes of Cr, Fe and Ni were calculated using EMPIRE 3.0 β1 (ARCOLE) from threshold to 20 MeV. The cross-sections are calculated using full featured Hauser–Feshbach statistical model with pre-equilibrium effects by invoking DEGAS option in the code. A good agreement between the calculated and experimental data (EXFOR data base) as well as evaluated data is obtained with option of neutron and proton potentials by Koning (Global) and HFB parity dependent nuclear level density. This is an important step to the validation of nuclear model with superior predictive power. The compound nucleus and pre-equilibrium reaction mechanisms as well as the isotopic effects were also studied.     

Analysis of (n, 2n) Cross Sections at 14.7 MeV in Region of Rare-Earths

Heat transfer by simultaneous conduction and radiation through ceramic fiber insulation is studied experimentally. The temperature profiles and the effective thermal conductivity are determined over a wide range of porosities of the insulation and of temperature provided at the hot boundary.

The resulting data are analyzed in detail to gain an understanding of the mechanism of heat transfer through such medium. A semi-empirical formula is derived for quantitatively predicting the thermal performance of ceramic fiber insulation. The formula incorporates as parameters the porosity and temperatures of the hot and cold boundaries.     

Excitation functions of (p,x) reactions on natural nickel up to 40 MeV

Production cross-sections of the residual radionuclides for the ^natNi(p,x)^{55,56,57,58 m + g}Co, ^56,57Ni nuclear reactions were measured up to 40 MeV by using a stacked-foil activation technique at the MC-50 cyclotron of the Korea Institute of Radiological and Medical Sciences. The results were compared with the reported experimental data as well as the theoretical calculations based on the TALYS and the ALICE-IPPE codes. The present results are in general good agreement with the other experimental data and calculated results. The integral yields for thick target were also deduced from the measured excitation functions of the produced radionuclides. The present experimental results will play an important role in enrichment of the literature data base for proton-induced reactions on natural nickel leading to various applications.