$^{\textrm{nat}}$ Pr+ PDMATHAAB C反应蒸发残渣截面的新测定--$^{149}$ Tb生成过程的比较研究
New measurement of cross section of evaporation residues from $^{\textrm{nat}}$Pr+$^{12}$C reaction: A comparative study on the production of $^{149}$Tb
摘要：
在44-79 MeV入射能量范围内，用叠箔技术和离线$γ$光谱法测量了$^{12}$ C诱导天然丰富的单核素镨靶反应中蒸发残渣$^{149}$ Tb，$^{150}$ Tb，$^{151}$ Tb和$^{149}$ Gd的产生截面.通过与已有的测量结果和核反应模型程序\textsc{PACE4}的理论预测结果的比较，对测量数据进行了解释。对于$^{149}$ Tb和$^{150}$ Tb，分别测量了约5%和14%的理论截面。$^{149}$ Tb的新横截面补充了先前通过$α$光谱法测量的横截面。$^{151}$ Tb的横截面与理论相当。$^{149}$ Gd的累积截面揭示了核反应机制。此外，还讨论了在钆同位素上的$p$ -和$α$ -诱导反应中产生$^{149}$ Tb的可行性。
英文摘要：
Production cross sections of evaporation residues, $^{149}$Tb, $^{150}$Tb, $^{151}$Tb and $^{149}$Gd, have been measured using the stacked foil technique followed by off-line $γ$-spectrometry in $^{12}$C induced reactions on naturally abundant mononuclidic praseodymium target in the 44-79 MeV incident energy range. Measured data have been interpreted comparing with previous measurements and theoretical prediction of nuclear reaction model code \textsc{PACE4}. About 5% and 14% of the theoretical cross sections have been measured for $^{149}$Tb and $^{150}$Tb, respectively. The new cross sections of $^{149}$Tb complement those measured earlier by $α$-spectrometry. Cross sections of $^{151}$Tb are comparable to the theory. Cumulative cross section of $^{149}$Gd sheds light on the nuclear reaction mechanism. In addition, a discussion has been made to show the feasibility of producing $^{149}$Tb in $p$- and $α$-induced reactions on gadolinium isotopes.
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