Measurement of cross section of the residues from the $^{11}$B-induced reaction on $^{89}$Y and $^{93}$Nb: Production of $^{97}$Ru and $^{101m}$Rh

摘要

The heavy-ion induced reactions on intermediate mass targets are complex innature, even at the low energies. To understand those nuclear reactionphenomena in detail, more experimental studies are required in a wide range ofenergy. Heavy-ion reactions were investigated by measuring production crosssections of the residues produced in the $^{11}$B-induced reactions on $^{89}$Yand $^{93}$Nb at low energies, near and above the barrier, and to check theeffectiveness of the different nuclear models to explain them. Further, aim isalso to optimize the production parameters of neutron deficient medicallyrelevant $^{97}$Ru and $^{101m}$Rh radioisotopes produced in those reactions,respectively. The $^{11}$B-beam was allowed to impinge on $^{89}$Y and$^{93}$Nb foils supported by an aluminum catcher foil, arranged in a stack, in27.5-58.7 and 30.6-62.3 MeV energy range, respectively. The$\gamma$-spectrometry was carried out after EOB to measure the activity of theradionuclides produced in each foil and cross sections were calculated.Measured cross-sectional data were analyzed in terms of compound andprecompound model calculations. The measured cross sections of the residuesshowed good agreement with the model calculations based on the Hauser-Feshbachformulation and exciton model. A substantial preequilibrium contribution wasnoticed in the 3$n$ reaction channel in both the reactions. Theoreticalestimations confirmed that major production yields are mostly contributed bythe compound reaction process. Preequilibrium emissions contributed at the highenergy tail of the 3$n$ channel for both the reactions. Moreover, an indirectsignature of a direct reaction influence was also observed in the $^{90m}$Yproduction.