Speaker
Description
The JYFLTRAP double Penning trap mass spectrometer at the Ion Guide Isotope Separator On-Line (IGISOL) facility offers excellent possibilities for high-precision mass measurements of radioactive ions. Using the new phase imaging technique (PI-ICR), ground and isomeric states can be separated, enabling independent measurements of their binding energies.
Accurate mass measurements of ground and isomeric states of $^{68-70}$Co have been performed at JYFLTRAP. The masses were measured, either for the first time for the isomeric states of $^{68}$Co and $^{70}$Co or with greatly improved precision for the others. Furthermore, the ordering of the low-spin and high-spin states for $^{68}$Co and $^{70}$Co could also be established, allowing on one hand to remove ambiguities on the mass surface beyond $N=40$, and on the other hand to demonstrate that the ground state in $^{70}$Co corresponds to an intruder configuration. The results of this experiment will be presented as well as their comparison with Large Scale Shell Model calculations.
