Activation Cross Sections for (n, p) and (n, α) Reactions on Nd, Sm, Yb and Lu at 14.6 MeV

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Activation cross sections for the (n, p) and (n, α) reactions of Nd, Sm, Yb and Lu have been measured at 14.6 MeV by using a Ge(Li) y-ray detector. The following cross sections (in millibarns) have been obtained : ¹⁵⁰Sm(n, p)¹⁵⁰Pm, 7.19±1.01 ; ¹⁷³Yb(n, p)¹⁷³Tm, 13.5±2.8 ; ¹⁷⁵Lu(n, p)¹⁷⁵Yb, 18.5±2.2 ; ¹⁴⁶Nd(n, α)¹⁴³Ce, 4.42±0.47 ; ¹⁵²Sm(n, α)¹⁴⁹Nd, 2.81±0.42 ; ¹⁷⁴Yb(n, α)¹⁷¹Er, 1.22±0.23 and ¹⁷⁶Lu(n, a)¹⁷³Tm, 2.30±0.57. The results are compared with predictions based on the evaporation, the pre-equilibrium and other models. The present experimental (n, p) cross sections agree fairly well with the pre-equilibrium model predictions. A comparison made between the experimental (n, α) cross sections and the predictions of the pre-equilibrium model suggests the existence of a mechanism of preequilibrium emission in the (n, α) reaction in this mass region.