High-precision measurements of low-lying isomeric states in ${}^{120-124}$In with JYFLTRAP double Penning trap

Abstract

Neutron-rich ${}^{120-124}$In isotopes have been studied utilizing the double Penning trap mass spectrometer JYFLTRAP at the IGISOL facility. Using the phase-imaging ion-cyclotron-resonance technique, the isomeric states were resolved from ground states and their excitation energies measured with high precision in ${}^{121,123,124}$In. In ${}^{120,122}$In, the $1^{+}$ states were separated and their masses were measured while the energy difference between the unresolved $5^{+}$ and $8^{-}$ states, whose presence was confirmed by post-trap decay spectroscopy was determined to be $\le 15$ keV. In addition, the half-life of ${}^{122}$Cd, $T_{1/2}=5.98(10)$ s, was extracted. Experimental results were compared with energy density functionals, density functional theory and shell-model calculations.

11 pages, 7 figures