Attar F M D, Bholane G T, Ganesapandy T S, Dhole S D, Bhoraskar V N
Department of Physics, AKI's Poona College, Pune, 411001, India.
Department of Physics, S.P. Pune University, Pune, 411007, India.
Appl Radiat Isot. 2022 Jun;184:110192. doi: 10.1016/j.apradiso.2022.110192. Epub 2022 Mar 11.
Isomeric cross sections for the Zr(n, α)Sr, Nb(n, α)Y and Mo(n, α)Zr 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 Zr(n, α)Sr and Nb(n, α)Y reactions are referenced to the Al(n, α)Na standard reaction cross section whereas those measured for Mo(n, α)Zr reaction are referenced to the Fe(n, p)Mn 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 Mo(n, α)Zr reaction is found to be the highest as compared to the other two reactions whereas, for the Zr(n, α)Sr 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.
利用活化技术结合高分辨率γ射线光谱法，在13.73 MeV至14.77 MeV范围内的五个中子能量下，测量了Zr(n, α)Sr、Nb(n, α)Y和Mo(n, α)Zr反应的异构截面。在本工作中，Zr(n, α)Sr和Nb(n, α)Y反应的截面测量以Al(n, α)Na标准反应截面为参考，而Mo(n, α)Zr反应的测量截面以Fe(n, p)Mn标准反应截面为参考。还使用EMPIRE - 3.2和TALYS 1.8代码在10 MeV至20 MeV的中子能量范围内对这些反应的截面进行了理论估计，并通过适当选择模型参数使其与实验截面相匹配。除了直接反应和统计豪泽 - 费什巴赫（HF）复合核机制外，还使用一致的模型参数集以及预平衡机制进行了至少八组不同的这些统计模型计算。这三个反应的测量截面随着中子能量从13.73 MeV增加到14.77 MeV而增加。当质子数从锆增加到铌或从铌增加到钼时增加一个，在每个相应的中子能量下，α粒子发射的概率也会增加。目前的结果表明，与其他两个反应相比，在每个中子能量下Mo(n, α)Zr反应的测量截面最高，而对于Zr(n, α)Sr反应，与所研究的其他两个反应相比，测量截面最低。从本测量中获得的结果与基于理论模型计算的反应截面以及早期作者报道的工作结果吻合良好。
