0000000000180084
AUTHOR
A. Klose
Charge Radii of ^{55,56}Ni Reveal a Surprisingly Similar Behavior at N=28 in Ca and Ni Isotopes.
Nuclear charge radii of $^{55,56}$Ni were measured by collinear laserspectroscopy. The obtained information completes the behavior of the chargeradii at the shell closure of the doubly magic nucleus $^{56}$Ni. The trend ofcharge radii across the shell closures in calcium and nickel is surprisinglysimilar despite the fact that the $^{56}$Ni core is supposed to be much softerthan the $^{48}$Ca core. The very low magnetic moment$\mu(^{55}\mathrm{Ni})=-1.108(20)\,\mu_N$ indicates the impact of M1excitations between spin-orbit partners across the $N,Z=28$ shell gaps. Ourcharge-radii results are compared to \textit{ab initio} and nuclear densityfunctional theory calculations, showing good agreeme…
Tests of atomic charge-exchange cells for collinear laser spectroscopy
Abstract The performance characteristics of two charge-exchange cells (CECs) with horizontal and vertical cell configurations were determined by neutralizing a 10-keV rubidium ion beam in a potassium vapor. The neutralization efficiency and the fluorescence line shape of the 5s 2 S 1 / 2 ↔ 5 p 2P3/2 (D2) transition in neutral 85Rb were investigated as a function of the reservoir temperature used to control the potassium vapor density. The CECs exhibited similar neutralization performance and at neutralization efficiencies greater than 25–50% an asymmetric line shape of the rubidium D2 fluorescent signal was observed. The asymmetry was attributed to inelastic channels in the charge-exchange …