Exploration of Astromers near A=130 with the Canadian Penning Trap

The synthesis of isotopes heavier than iron occurs primarily in the hot, neutron-rich environments where the astrophysical rapid, intermediate, and slow neutron capture processes occur. Simulations of these processes have historically considered only the ground states of the nuclei involved in these reaction networks. However, recent efforts have shown that isomeric states of significantly different half-lives from their ground states can be populated via decay, thermally, or in neutron captures, and can thus require separate treatment from their ground states in reaction networks. States requiring such treatment are called ``astromers''. Using the Canadian Penning Trap mass spectrometer at the Californium Rare Isotope Breeder Upgrade (CARIBU) facility at Argonne National Laboratory, we conducted a series of mass measurements of ground and isomeric states near ¹³²Sn, and identified an r- and i-process astromer in ¹²⁹Sn. I will be presenting on all the masses measured and the evaluation of their potential as astromers.