Precision mass measurements of ${}^{125-127}$Cd isotopes and isomers approaching the $N=82$ closed shell

Abstract

We present the results of precision mass measurements of neutron-rich cadmium isotopes. These nuclei approach the $N=82$ closed neutron shell and are important to nuclear structure as they lie near doubly-magic ${}^{132}$Sn on the chart of nuclides. Of particular note is the clear identification of the ground state mass in ${}^{127}$Cd along with the isomeric state. We show that the ground state identified in a previous mass measurement which dominates the mass value in the Atomic Mass Evaluation is an isomeric state. In addition to ${}^{127/m}$Cd, we present other cadmium masses measured (${}^{125/m}$Cd and ${}^{126}$Cd) in a recent TITAN experiment at TRIUMF. Finally, we compare our measurements to new \emph{ab initio} shell-model calculations and comment on the state of the field in the $N=82$ region.

8 Pages with citations, 3 Figures, 2 Tables