Spins and Magnetic Moments of <sup>49</sup>K and <sup>51</sup>K: Establishing the 1/2<sup>+</sup> and 3/2<sup>+</sup> Level Ordering Beyond N=28
- Papuga, J.
- Bissell, M.
- Kreim, K.
- Blaum, K.
- Brown, B.
- Rydt, M.
- Garcia Ruiz, R.
- Heylen, H.
- Kowalska, M.
- Neugart, R.
- Neyens, G.
- Nörtershäuser, W.
- Otsuka, T.
- Rajabali, M.
- Sánchez, R.
- Utsuno, Y.
- Yordanov, D.
Publication date
April 2013
DOIAbstract
The ground-state spins and magnetic moments of <sup>49,51</sup>K have been measured using bunched-beam high-resolution collinear laser spectroscopy at ISOLDE CERN. For <sup>49</sup>K a ground-state spin I=1/2 was firmly established. The observed hyperfine structure of <sup>51</sup>K requires a spin I>1/2 and strongly suggests I=3/2. From its magnetic moment μ(<sup>51</sup>K)=+0.5129(22)μ<sub>N</sub> a spin-parity I<sup>π</sup>=3/2<sup>+</sup> with a dominant π1d<sub>3/2</sub><sup>-1</sup> hole configuration was deduced. This establishes for the first time the reinversion of the single-particle levels and illustrates the prominent role of the residual monopole interaction for single-particle levels and shell evolution
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