Skip to Main content Skip to Navigation
Journal articles

Shell structure of potassium isotopes deduced from their magnetic moments

Abstract : Background: Ground-state spins and magnetic moments are sensitive to the nuclear wave function, thus they are powerful probes to study the nuclear structure of isotopes far from stability. Purpose: Extend our knowledge about the evolution of the 1/2+ and 3/2+ states for K isotopes beyond the N=28 shell gap. Method: High-resolution collinear laser spectroscopy on bunched atomic beams. Results: From measured hyperfine structure spectra of K isotopes, nuclear spins, and magnetic moments of the ground states were obtained for isotopes from N=19 up to N=32. In order to draw conclusions about the composition of the wave functions and the occupation of the levels, the experimental data were compared to shell-model calculations using SDPF-NR and SDPF-U effective interactions. In addition, a detailed discussion about the evolution of the gap between proton 1d3/2 and 2s1/2 in the shell model and ab initio framework is also presented. Conclusions: The dominant component of the wave function for the odd-A isotopes up to K45 is a π1d−13/2 hole. For K47,49, the main component originates from a π2s−11/2 hole configuration and it inverts back to the π1d−13/2 in K51. For all even-A isotopes, the dominant configuration arises from a π1d−13/2 hole coupled to a neutron in the ν1f7/2 or ν2p3/2 orbitals. Only for K48, a significant amount of mixing with π2s−11/2⊗ν(pf) is observed leading to a Iπ=1− ground state. For K50, the ground-state spin-parity is 0− with leading configuration π1d−13/2⊗ν2p−13/2.
Document type :
Journal articles
Complete list of metadatas
Contributor : Sophie Heurteau <>
Submitted on : Monday, December 22, 2014 - 2:51:29 PM
Last modification on : Tuesday, December 1, 2020 - 6:42:03 PM

Links full text




J. Papuga, M. L. Bissell, K. Kreim, C. Barbieri, K. Blaum, et al.. Shell structure of potassium isotopes deduced from their magnetic moments. Physical Review C, American Physical Society, 2014, 90, pp.034321. ⟨10.1103/PhysRevC.90.034321⟩. ⟨in2p3-01097952⟩



Record views