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The flux-weighted average cross sections of the  89 Y(γ, x n;  x =1–4) 89− x   Y reactions and the isomeric yield ratios of the  87m,g Y,  86m,g Y, and  85m,g Y radionuclides produced in these reactions with the bremsstrahlung end-point energies of 65, 70 and 75 MeV have been determined by an activation and off-line γ-ray spectrometric technique using the 100 MeV electron linac in Pohang Accelerator Laboratory, Korea. The theoretical  89 Y(γ, x n;  x =1–4) 89− x   Y reactioncross sections for mono-energetic photonshave been calculated using the computer code TALYS 1.6. Then the flux-weighted theoretical values were obtaind to compare with the present data. The flux-weighted experimental and theoretical  89 Y(γ, x n;  x =1–4) 89− x   Y reaction cross sections increase very fast from the threshold values to a certain bremsstrahlung energy, wherethe other reaction channels open up. Thereafter it remains constant a while and then slowly decreases with the increase of cross sections for other reactions. Similarly, the isomeric yield ratios of  87m,g Y, 86m,g Y and  85m,g Y in the  89 Y(γ, x n;  x =2–4) 89− x   Y reactions from the present work and literature data show an increasing trend from their respective threshold values to a certain bremsstrahlung energy. After a certain point ofenergy, the isomeric yield ratios increase slowly with the bremsstrahlung energy. These observations indicate the role of excitation energy and its partitioning in different reaction channels.

radiochimica acta

Measurement of photo-neutron cross sections and isomeric yield ratios in the  89 Y(γ, x n) 89− x   Y reactions at the bremsstrahlung end-point energies of 65, 70 and 75 MeV