New measurement of cross sections of evaporation residues from the natPr +12C reaction: A comparative study on the production of 149Tb

摘要

Production cross sections of evaporation residues, 149Tb, 150Tb, 151Tb, and 149Gd, are measured using the stacked foil technique followed by off-line γ-spectrometry in 12C-induced reactions on naturally abundant mononuclidic praseodymium target in the 44- to 79-MeV incident energy range. Measured data are interpreted by comparison with previous measurements and theoretical predictions of the nuclear reaction model code PACE4. About 5% and 14% of the theoretical cross sections have been measured for 149Tb and 150Tb, respectively. The new cross sections of 149Tb complement those measured earlier by α spectrometry. Cross sections of 151Tb are comparable to the theory. Cumulative cross sections of 149Gd shed light on the nuclear reaction mechanism. In addition, the discussion shows the feasibility of producing 149Tb in p- and α-induced reactions on gadolinium isotopes.