Isomeric states of fission fragments explored via Penning trap mass spectrometry at IGISOL
Abstract
The masses of 84Br, 105Mo, 115,119,121Pd, 122Ag, 127,129In, 132Sb and their respective isomeric states have been measured with the JYFLTRAP Penning trap mass spectrometer using the phase-imaging ion-cyclotron-resonance technique. The excitation energies of the isomeric states in 132Sb and 119Pd were experimentally determined for the first time, while for 84Br, 115Pd and 127,129In, the precision of the mass values was substantially improved. In 105Mo and 121Pd there were no signs of a long-lived isomeric state. The ground-state measurements of 119Pd and 122Ag indicated that both are significantly more bound than the literature values. For 122Ag, there was no indication of a proposed third long-lived state. The results for the N=49 nucleus 84Br and isomers close to doubly magic 132Sn have been compared to the shell-model and the microscopic quasiparticle-phonon model calculations.
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