Speaker
Description
The neutron-rich Sb isotopes beyond the N=82 shell closure provide a sensitive testing ground for nuclear structure far from stability. Precision mass measurements in this region are key inputs for studying neutron pairing, the evolution of two-neutron separation energies, and the possible emergence of a subshell closure at N≈90.
The Multiple-Reflection Time-of-Flight Mass Spectrometer (MR-TOF-MS) at TITAN-TRIUMF is particularly well suited for accessing such short-lived and weakly produced isotopes. Its fast measurement cycles, high resolving power, and sensitivity enable measurements on the millisecond timescale at yields well below one ion per second, while simultaneously suppressing isobaric contaminants.
In this work, we report mass measurements of neutron-rich $^{136-140}$Sb performed with the TITAN MR-TOF-MS, including first-time measurements of $^{139-140}$Sb. These results offer new insights into nuclear structure beyond N=82.