90Zr(n,α)87Srm,93Nb(n,α)90Ym和92Mo(n,使用活化技术结合高分辨率γ射线光谱法,在13.73MeV-14.77MeV的五个中子能量下测量了α)89Zrm反应。在目前的工作中,测量90Zr(n,α)87Srm和93Nb(n,α)90Ym反应参考27Al(n,α)24Na标准反应截面,而92Mo(n,α)89Zrm反应参考56Fe(n,p)56Mn标准反应截面。在10MeV-20MeV的中子能量范围内,还使用EMPIRE-3.2和TALYS1.8代码从理论上估算了这些反应的横截面,并通过适当选择模型参数与实验横截面相匹配。除了直接反应和统计Hauser-Feshbach(HF)复合核外,还使用一致的模型参数集以及平衡前机制,进行了至少八组不同的统计模型计算。这三个反应的测量横截面随着中子能量从13.73MeV增加到14.77MeV而增加。当我们从锆到铌或从铌到钼时,质子数增加了1,α粒子发射的概率在每个相应的中子能量下也增加。目前的结果表明,对于92Mo(n,与其他两个反应相比,α)89Zrm反应最高,对于90Zr(n,α)87Srm反应,与所研究的其他两个反应相比,测得的横截面最低。发现从当前测量获得的结果与基于理论模型的计算反应截面以及早期作者报告的工作非常吻合。
Isomeric cross sections for the 90Zr(n, α)87Srm, 93Nb(n, α)90Ym and 92Mo(n, α)89Zrm reactions were measured at five neutron energies over the range 13.73 MeV-14.77 MeV using the activation technique in combination with high resolution γ-ray spectrometry. In the present work, the cross sections are measured for the 90Zr(n, α)87Srm and 93Nb(n, α)90Ym reactions are referenced to the 27Al(n, α)24Na standard reaction cross section whereas those measured for 92Mo(n, α)89Zrm reaction are referenced to the 56Fe(n, p)56Mn standard reaction cross section. The cross sections for these reactions were also theoretically estimated using the EMPIRE-3.2 and TALYS 1.8 codes over the neutrons energy range of 10 MeV-20 MeV and matched with the experimental cross sections by making a proper choice of the model parameters. A minimum eight different sets of these statistical model calculations were performed by using the consistent sets of model parameters along with the pre-equilibrium mechanism in addition to the direct-reaction and the statistical Hauser-Feshbach (HF) compound nucleus ones. The measured cross sections for these three reactions increase with the increase in neutron energy from 13.73 MeV to 14.77 MeV. As the proton number increased by one when we go from zirconium to niobium or from niobium to molybdenum, the probability of alpha particle emission also increases at each corresponding neutron energy. The present results indicate that the measured cross section at each neutron energy for the 92Mo(n, α)89Zrm reaction is found to be the highest as compared to the other two reactions whereas, for the 90Zr(n, α)87Srm reaction, the measured cross section is found to be the lowest as compared to the other two reactions studied. The results obtained from the present measurement are found to be in good agreement with the calculated reaction cross section based on theoretical models and also with the work reported by earlier authors.