Universal trend of charge radii of even-even Ca–Zn nuclei

Abstract

Universal trend of charge radii of even-even Ca-Zn nuclei. Physical Review C, 105(2), Article L021303.

Evolution of N = 20, 28, 50 shell closures in the 20 ≤ Z ≤ 30 region in deformed relativistic Hartree-Bogoliubov theory in continuum*

“…We note that the neutron numbers and have been predicted to be magic in some works. For instance, the precise measurements of masses of Ca established prominent shell closures at [71], and the energy of the state of Ca confirmed the existence of the shell closure [11]. Nonetheless, the charge radii studied here show no indications of a shell closure, which is consistent with the conclusions presented in Refs.…”

Charge Radii of Ni55,56 Reveal a Surprisingly Similar Behavior at N=28Sommer1, König2, Rossi3 et al. 2022Phys. Rev. Lett.Self Cite16380View full textAdd to dashboardCite

“…A comparison of the change in mean-square charge radius, δhr 2 c i, across a neutron shell closure for several isotones reveals a remarkable similarity for the neutron shell closures at N ¼ 28, 50, 82, and 126 [8,16]. The evolution of δhr 2 c i above N ¼ 28 is already established for K, Ca, Mn, and Fe isotopes [15,[17][18][19] and are indeed very similar [20]. A measurement of the charge radius of 56 Ni provides essential data to study trends in δhr 2 c i for two doubly magic nuclei with the same neutron magic gap, of which the neutron-rich 48 Ca is known to have a fairly strong N ¼ 28 shell closure [21].…”

“…Our nuclear density functional theory (DFT) calculations follow the methodology of Refs. [20,35]. We use two nonrelativistic energy density functionals (EDFs), namely, a Skyrme functional SV-min (HFB), a variant of SV-min [75], and a Fayans functional FyðΔr; HFBÞ [76].…”

“…In contrast to DFT, VS-IMSRG and IM-CI do not include these statistical uncertainties, but assess the systematic theoretical uncertainties from the truncation of the manybody expansion and, in the case of IM-CI, also the expansion of the interactions. Moreover, the proton-rich Ni isotopes have considerable zero-point quadrupole fluctuations which have been estimated as in [20,79]; they provide an estimate of the systematic error for DFT.…”

King-plot analysis of isotope shifts in simple diatomic molecules

“…By tracing the evolution of the isotope shift across an isotopic range, the changes in mean-squared nuclear charge radii can be studied with high accuracy. The nuclear charge radius is a nuclear-structure observable of importance, as precision measurements across the nuclear chart continue to challenge the predictive ability of ab initio nuclear theory [5,[8][9][10], and by extension our understanding of the observable. Such precision studies in nuclei with extreme proton-to-neutron ratios are a key pathway to obtaining new insights into the strong nuclear interaction.…”