Independent isomeric yield ratio ofI134in the photofission ofU235andU238

The independent isomeric yield ratio of ${}_{}{}^{134}{}_{}{}^{}\mathrm{I}$ has been determined radiochemically for the photofission of ${}_{}{}^{235}{}_{}{}^{}\mathrm{U}$ and ${}_{}{}^{238}{}_{}{}^{}\mathrm{U}$ with bremsstrahlung with end-point energies ranging from 12 to 30 MeV. The root-mean-square values of the angular momentum of the corresponding fission fragments, $J_{\mathrm{rms}}$, calculated using a statistical deexcitation model show an independence on the compound nucleus angular momentum and excitation energy. This $J_{\mathrm{rms}}$ behavior is compared to the results obtained in thermal neutron induced and medium-energy particle induced fission.