Description
The magnetic moment or $g$ factor of a nuclear quantum state gives a sensitive test of its proton versus neutron character. There are extensive data on the first-excited states of even-even nuclei measured by the transient-field technique. However, many of these data have a large uncertainty due to the difficulty of calibrating the transient field, which must be referenced to an independently known $g$ factor. The problem is particularly acute for nuclei with atomic numbers $14 < Z < 40$ where there are no suitably precise known $g$ factors to serve as a calibration.
Precise reference measurements can be performed using the time-differential recoil-in-vacuum method with a plunger device, which utilises the interaction between the magnetic moment of the nucleus and the hyperfine fields of the electron configuration, which in particular cases can be calculated precisely by atomic structure codes. This method has been demonstrated for hydrogen-like ions, and has recently been proven for sodium-like ions. However, it has not yet been demonstrated for lithium-like ions, and the case of sodium-like ions must be confirmed and extended to neighbouring nuclei.
This talk reports on measurements performed on lithium-like $^{46}$Ti ions at the University of Jyväskylä, and the development and use of a new plunger device for complementary measurements on sodium-like $^{46}$Ti ions at the Australian Heavy Ion Accelerator Facility. This new capability will enable precise reference measurements for a range of nuclei, providing crucial calibration values for a large set of both past and future $g$-factor measurements.
| I am the presenting author | Yes |
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