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 and states for K isotopes beyond the 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 up to . 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 and in the shell model and ab initio framework is also presented.
Conclusions: The dominant component of the wave function for the odd- isotopes up to is a hole. For , the main component originates from a hole configuration and it inverts back to the in . For all even- isotopes, the dominant configuration arises from a hole coupled to a neutron in the or orbitals. Only for , a significant amount of mixing with is observed leading to a ground state. For , the ground-state spin-parity is with leading configuration .
3 More- Received 4 July 2014
DOI:https://doi.org/10.1103/PhysRevC.90.034321
©2014 American Physical Society