0000000000180081
AUTHOR
P. Imgram
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…
Probing the single-particle behavior above Sn132 via electromagnetic moments of Sb133,134 and N=82 isotones
Magnetic and quadrupole moments of the $7/{2}^{+}$ ground state in $^{133}\mathrm{Sb}$ and the $({7}^{\ensuremath{-}})$ isomer in $^{134}\mathrm{Sb}$ have been measured by collinear laser spectroscopy to investigate the single-particle behavior above the doubly magic nucleus $^{132}\mathrm{Sn}$. The comparison of experimental data of the $7/{2}^{+}$ states in $^{133}\mathrm{Sb}$ and neighboring $N=82$ isotones to shell-model calculations reveals the sensitivity of magnetic moments to the splitting of the spin-orbit partners $\ensuremath{\pi}0{g}_{9/2}$ and $\ensuremath{\pi}0{g}_{7/2}$ across the proton shell closure at $Z=50$. In contrast, quadrupole moments of the $N=82$ isotones are insen…
Evidence of a sudden increase in the nuclear size of proton-rich silver-96
Understanding the evolution of the nuclear charge radius is one of the long-standing challenges for nuclear theory. Recently, density functional theory calculations utilizing Fayans functionals have successfully reproduced the charge radii of a variety of exotic isotopes. However, difficulties in the isotope production have hindered testing these models in the immediate region of the nuclear chart below the heaviest self-conjugate doubly-magic nucleus 100Sn, where the near-equal number of protons (Z) and neutrons (N) lead to enhanced neutron-proton pairing. Here, we present an optical excursion into this region by crossing the N = 50 magic neutron number in the silver isotopic chain with th…