Measurement of ¹⁶⁹Tm(n, 2n)¹⁶⁸Tm reaction cross sections from 12 to 19.8 MeV

The cross sections of the Tm-169(n, 2n)Tm-168 reaction have been measured at incident energies of 12 to 19.8 MeV using the activation technique, relative to the Nb-93(n, 2n)(92)mNb reaction. Thulium (Tm) samples were irradiated on the surface of a two-ring orientation assembly with neutrons produced from the H-3(d, n)He-4 reaction at the 5SDH-2 1.7-MV Tandem accelerator in China. Theoretical model calculations were performed. The present data were then compared with previous experimental data and available evaluated data. This study provides more precise nuclear data for improvement of future evaluations.