Nuclear charge radii of potassium isotopes beyond N=28

Abstract

We report on the measurement of optical isotope shifts for ${}^{38,39,42,44,46\text{-}51}$K relative to ${}^{47}$K from which changes in the nuclear mean square charge radii across the N=28 shell closure are deduced. The investigation was carried out by bunched-beam collinear laser spectroscopy at the CERN-ISOLDE radioactive ion-beam facility. Mean square charge radii are now known from ${}^{37}$K to ${}^{51}$K, covering all $\nu f_{7/2}$-shell as well as all $\nu p_{3/2}$-shell nuclei. These measurements, in conjunction with those of Ca, Cr, Mn and Fe, provide a first insight into the $Z$ dependence of the evolution of nuclear size above the shell closure at N=28.

References in corpus (3)

• Nuclear magic numbers: new features far from stability
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