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

Abstract

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 been measured at the JYFLTRAP double Penning trap, by employing the Phase-Imaging Ion-Cyclotron-Resonance technique. With the significantly improved mass resolution of this novel method isomeric states separated by 140 keV from the ground 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, of importance for nuclear structure, fission and astrophysics. In the present work the experimental isomeric yield ratios are used for the estimation of the root-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 values of $J_{\mathrm{rms}}$ display a linear relationship when compared with the electric quadrupole moments of the fission products.

arXiv comment10 pages, 4 captioned figures

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• Isomeric states of fission fragments explored via Penning trap mass spectrometry at IGISOL
• Discovery of a new long-lived isomer in ${}^{114}$Rh via Penning-trap mass spectrometry
• Disentangling the influence of excitation energy and compound nucleus angular momentum on fission fragment angular momentum
• High-precision mass measurements of the ground and isomeric states in ${}^{124,125}$Ag
• Isomeric yield ratios and mass spectrometry of Y and Nb isotopes in the neutron-rich N=60 region: the unusual case of ${}^{98}$Y