Spins and Magnetic Moments of ${}^{49}$K and ${}^{51}$K: establishing the 1/2${}^{+}$ and 3/2${}^{+}$ level ordering beyond $N$ = 28

Abstract

The ground-state spins and magnetic moments of ${}^{49,51}$K have been measured using bunched-beam high-resolution collinear laser spectroscopy at ISOLDE-CERN. For ${}^{49}$K a ground-state spin $I=1/2$ was firmly established. The observed hyperfine structure of ${}^{51}$K requires a spin $I>1/2$ and from its magnetic moment $\mu {(}^{51}\text{K})=+0.5129(22){\mu }_N$ a spin/parity $I^{\pi }=3/2^{+}$ with a dominant $\pi 1d_{3/2}^{-1}$ hole configuration was deduced. This establishes for the first time the re-inversion of the single-particle levels and illustrates the prominent role of the residual monopole interaction for single-particle levels and shell evolution.

5 pages, 3 figures

References in corpus (5)

• Collapse of the N=28 shell closure in ${}^{42}$Si
• A new effective interaction for $0\hslash \omega$ shell model calculations in the sdpf valence space
• New precision mass measurements of neutron-rich calcium and potassium isotopes and three-nucleon forces
• Evolution of the proton sd states in neutron-rich Ca isotopes
• Evolution of the $E(1/2_1^{+})-E(3/2_1^{+})$ energy spacing in odd-mass K, Cl and P isotopes for $N=20-28$

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• Magnetic dipole and electric quadrupole moments of the 229Th nucleus
• Shell structure of potassium isotopes deduced from their magnetic moments
• Emergence of simple patterns in many-body systems: from macroscopic objects to the atomic nucleus
• Nuclear DFT analysis of electromagnetic moments in odd near doubly magic nuclei
• $\mathbf{N}=32$ shell closure below calcium: Low-lying structure of ${}^{50}$Ar
• Investigation of the ground-state spin inversion in the neutron-rich 47,49Cl isotopes
• A First Glimpse at the Shell Structure beyond ${}^{54}$Ca: Spectroscopy of ${}^{55}$K, ${}^{55}$Ca, and ${}^{57}$Ca
• The Bohr-Weisskopf effect in the potassium isotopes