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

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