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The cross sections of the  138 Ce( n , 2 n ) 137m,g Ce reactions and their isomeric cross section ratios  σ  m / σ  g  were measured at three neutron energies between 13.5 and 14.8 MeV using the activation technique. CeO 2  samples and Nb monitor foils were activated together to determine the reaction cross section and the incident neutron flux. The monoenergetic neutron beams were formed via the  3 H( d ,  n ) 4 He reaction. The activities induced in the reaction products were measured using high-resolution  γ -ray spectroscopy. The pure cross section of the ground-state was derived from the absolute cross section of the metastable state and the residual nuclear decay analysis. The cross sections were also estimated using the nuclear model code, TALYS-1.6 with different level density options at neutron energies varying from the reaction threshold to 20 MeV. Results are discussed and compared with the corresponding literature data.

Ground-state and isomeric-state cross sections for the 138 Ce( n ,2 n ) 137 Ce reaction from its threshold to 20 MeV

Ground-state and isomeric-state cross sections for the 138 Ce( n ,2 n ) 137 Ce reaction from its threshold to 20 MeV