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Title: Shell structure of potassium isotopes deduced from their magnetic moments
Authors: Papuga, J. ×
Bissell, M. L.
Kreim, K.
Barbieri, C.
Blaum, K.
De Rydt, M.
Duguet, T.
Garcia Ruiz, R. F.
Heylen, H.
Kowalska, M.
Neugart, R.
Neyens, G.
Noertershaeuser, W.
Rajabali, M. M.
Sanchez, R.
Smirnova, N.
Soma, V.
Yordanov, D. T. #
Issue Date: Sep-2014
Publisher: Published for the American Physical Society by the American Institute of Physics
Series Title: Physical Review C, Nuclear Physics vol:90 issue:3 pages:034321-12
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 45K is a π1d−1_{3/2} hole.
For 47,49K, the main component originates from a π2s−1_{1/2} hole configuration and it inverts back to the π1d−1_{3/2} in 51K. For all even-A isotopes, the dominant configuration arises from a π1d−1_{3/2} hole coupled to a neutron in the ν1f7/2 or ν2p3/2 orbitals. Only for 48K, a significant amount of mixing with π2s−1_{1/2}⊗ ν(pf ) is observed leading to a I^π = 1− ground state. For 50K, the ground-state spin-parity is 0− with leading configuration π1d−1_{3/2}⊗ ν2p−1_{3/2}.
ISSN: 0556-2813
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Nuclear and Radiation Physics Section
× corresponding author
# (joint) last author

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