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.
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