Laser spectroscopic studies of elements in the heavy actinide and transactinide region help understand the nuclear ground state properties of these heavy systems. Pioneering experiments at GSI, Darmstadt identified the first atomic transitions in the element nobelium. For the purpose of determining nuclear properties in nobelium isotopes with higher precision, a new apparatus for high-resolution laser spectroscopy in a gas-jet called JetRIS is under development. To determine the spectral resolution and the homogeneity of the gas-jet, the laser-induced fluorescence of 164Dy atoms seeded in the jet was studied. Different hypersonic nozzles were investigated for their performance in spectral resolution and efficiency. Under optimal conditions, a spectral linewidth of about 200–250 MHz full width at half maximum and a Mach number of about 7 was achieved, which was evaluated in context of the density profile of the atoms in the gas-jet.
The hyperfine coupling constants of neutron deficient 37 Ca were deduced from the atomic hyperfine spectrum of the 4s 2 S 1/2 ↔ 4p 2 P 3/2 transition in Ca II, measured using the collinear laser spectroscopy technique. The ground-state magnetic-dipole and spectroscopic electric-quadrupole moments were determined for the first time as µ = +0.7453(72)µN and Q = −15(11) e 2 fm 2 , respectively. The experimental values agree well with nuclear shell model calculations using the USDA/B interactions in the sd-model space with a 95% probability of the canonical nucleon configuration.It is shown that the magnetic moment of 39 Ca requires a larger non-sd-shell component than that of 37 Ca for good agreement with the shell-model calculation, indicating a more robust closed subshell structure of 36 Ca at the neutron number N = 16 than 40 Ca. The results are also compared to valence-space in-medium similarity renormalization group calculations based on chiral two-and three-nucleon interactions.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.