Beam energy determination via collinear laser spectroscopy

Charge Radii of Ni55,56 Reveal a Surprisingly Similar Behavior at N=28Sommer1, König2, Rossi3 et al. 2022Phys. Rev. Lett.Self Cite15380View full textAdd to dashboardCite

“…A pair of reference measurements of 58; 60 Ni isotopes from the off-line PIG source was conducted typically once every 6-12 h. These reference measurements were used to determine the isotope shifts of the short-lived 54−56 Ni isotopes with respect to 60 Ni and also allowed to calibrate the ion energy to the known absolute transition frequency of 60 Ni [50].…”

“…For the low-production isotopes 54 Ni and 55 Ni, the uncertainties of the isotope shifts are dominated by the fit uncertainty of their centroid positions. For 56 Ni and the stable 58 Ni, uncertainties of the frequency measurements [50] and an observed deviation between bunched-beam and continuous-beam measurements [51] are the prevailing contributions to the isotope-shift uncertainties.…”

Ground State Magnetic Dipole Moment of $^{40}$Sc

“…The COG frequency was used to calibrate the Sc ion beam energy in the online 40 Sc hyperfine spectrum measurements. The 45 Sc calibration spectra were used to deduce the ion beam energy as described in [25], where the 20 MHz systematic uncertainty in the COG is mostly canceled. The ion beam energy was determined with less than 0.3 eV uncertainty, which contributes to the systematic uncertainties of the stable hyperfine coupling constants by less than 10 ppm.…”

Charge Radius of Neutron-deficient $^{54}$Ni and Symmetry Energy Constraints Using the Difference in Mirror Pair Charge Radii

“…A Penning Ionization Gauge (PIG) ion source [35] was used to generate beams of stable 58,60 Ni isotopes, and spectroscopy was performed every 4-6 hours throughout the data taking time for 54 Ni. The resonance frequencies of 58,60 Ni were used as the reference for the extraction of the 54 Ni isotope shift as well as to determine the kinetic beam energy with 10 −5 relative accuracy [39]. When changing between the isotopes, the laser frequency was adjusted to perform spectroscopy at the same beam energy.…”