Ground-state electromagnetic moments of Ca37

Abstract

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.

Emergence of simple patterns in many-body systems: from macroscopic objects to the atomic nucleus

“…scaled inverse of the excitation energy of the first 2 + state, 1/E 2 + Z; and v. normalized transition probability to the first 2 + excited state, B(E2)/Z 2 R 2 . Experimental data were taken from [38,101,113,[131][132][133][134][135][136][137][138][139][140].…”

Testing ab initio nuclear structure in neutron-rich nuclei: Lifetime measurements of second 2+ state in C16 and Ciemała1, Ziliani2, Crespi3 et al. 2020Phys. Rev. CSelf Cite171110View full textAdd to dashboardCite

“…NN and normal-ordered 3N interactions are included up to third order, neglecting residual 3N interactions. Effective operators are used to calculate EM transitions [58,59]. The shell-model diagonalizations were performed with the code ANTOINE [60].…”

Gamma spectroscopy with AGATA in its first phases: New insights in nuclear excitations along the nuclear chart

“…NN and normal-ordered 3N interactions were included up to third order, neglecting residual 3N interactions. Effective operators were used to calculate EM transitions [82,83]. The MBPT results reproduce well the 2 + 1 → 0 + lifetime in 20 O (τ = 11.7 ps versus the experimental τ = 10.5(4) ps [84]), and this agreement does not depend significantly on the inclusion of 3N interactions.…”

“…Mass measurements in this region evidenced a minimum of the N = 50 shell gap at Z = 32 [121,122]. Studying the structure of 83,85 Se isotopes, Porquet et al concluded to a N = 50 gap quenching by 300 keV for each proton pair removed from the fp shell [123]. On the contrary, [124][125][126] inferred the stability of the N = 50 gap towards 78 Ni.…”