An alternative method for determining the isomeric yield ratio and its application for 102m,gRh formed in 103Rh(γ,n) reaction with 60, 65, and 70 MeV bremsstrahlung

초록

The isomeric yield ratio (IYR) for the isomeric pair formed in the bremsstrahlung-induced reaction is often determined with the activation method where the activity of the isomeric pair is measured by a gamma spectrometer of well-known detection efficiency. This work introduces an alternative method to extract the IYR without external efficiency information. The proposed method was applied to extract the IYR of the 102m,gRh isomeric pair produced in 103Rh(gamma,n) reaction with 60, 65, and 70 MeV bremsstrahlung. The results are compared to those obtained using the absolute efficiency calibration to validate the proposed method. The experimental IYRs for the 102m,gRh pair with 65 and 70 MeV bremsstrahlung endpoint energies are reported for the first time. The theoretical prediction of IYR in 103Rh(gamma,n)102Rh was calculated using TALYS and GEANT4. The current data shows the best agreement with TALYS calculation with Skyrme level densities from Hilaire's combinatorial tables, while old measurements agree with Skyrme level densities from Goriely's tables.

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