Abstract
The independent isomeric yield ratios of 89g,mZr from the natZr(\( \gamma\),xn) reactions and those of 91g, mMo and 97g,mNb from the natMo(\( \gamma\),x) reactions with the bremsstrahlung end-point energy of 45-70 MeV were determined by an off-line \(\gamma\)-ray spectrometric technique using the 100 MeV electron linac at the Pohang Accelerator Laboratory, Korea. The isomeric yield ratios of 89g,mZr and 97g,mNb from the natZr(\( \gamma\), xn) and natMo(\( \gamma\),x) reactions at the bremsstrahlung end-point energy of 16MeV were also determined by the same technique using the 20MeV electron linac at Helmholtz-Zentrum Dresden-Rossendorf, Germany. The measured isomeric yield ratios of 89g,mZr, 91g,mMo, and 97g,mNb were compared with literature data to examine the role of the Giant Dipole Resonance (GDR). The isomeric yield ratios of the 89g,mZr, 91g,mMo, and 97g,mNb from the above reactions were also calculated by using the computer code TALYS 1.6 and compared with the experimental data to examine the validity of the theoretical model for independent isomeric yield ratio calculations.
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