The (n,2n) reaction cross-section calculations for some neighbor deformed target nuclei have been made in the region of rare-earth elements between 8 and 24 MeV incident energy. In the calculations, the geometry dependent hybrid model and the exciton model have been used including the effects of pre-equilibrium. Pre-equilibrium direct effects have been examined using full exciton model. The measured cross-sections are taken from literatures. The cross-sections were calculated using other semi-empirical formulas for the incoming energieswhich satisfy the condition U-R = E-n + Q(n,2n) = 6 +/- 1 MeV. The obtained results were discussed and compared with the available experimental data, and found to be well in agreement.