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Isomeric yield ratios for the odd-$A$ isotopes of $^{119-127}$Cd and$^{119-127}$In from 25-MeV proton-induced fission on natural uranium have beenmeasured at the JYFLTRAP double Penning trap, by employing the Phase-ImagingIon-Cyclotron-Resonance technique. With the significantly improved massresolution of this novel method isomeric states separated by 140 keV from theground state, and with half-lives of the order of 500 ms, could be resolved.This opens the door for obtaining new information on low-lying isomers, ofimportance for nuclear structure, fission and astrophysics. In the present workthe experimental isomeric yield ratios are used for the estimation of theroot-mean-square angular momentum ($J_\mathrm{rms}$) of the primary fragments.The results show a dependency on the number of unpaired protons and neutrons,where the odd-$Z$ In isotopes carry larger angular momenta. The deduced valuesof $J_\mathrm{rms}$ display a linear relationship when compared with theelectric quadrupole moments of the fission products.

Isomeric fission yield ratios for odd-mass Cd and In isotopes using the Phase-Imaging Ion-Cyclotron-Resonance technique