Charge radii of 55,56Ni reveal a surprisingly similar behavior at N=28 in Ca 
and Ni isotopes

Sommer, F.; König, K.; Rossi, D. M.; Everett, N.; Garand, D.; de Groote, R. P.; Holt, J. D.; Imgram, P.; Incorvati, A.; Kalman, C.; Klose, A.; Lantis, J.; Liu, Y.; Miller, A. J.; Minamisono, K.; Miyagi, T.; Nazarewicz, W.; Nörtershäuser, W.; Pineda, S. V.; Powel, R.; Reinhard, P. -G.; Renth, L.; Romero-Romero, E.; Roth, R.; Schwenk, A.; Sumithrarachchi, C.; Teigelhöfer, A.

doi:10.1103/PhysRevLett.129.132501

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Charge radii of ^55,56Ni reveal a surprisingly similar behavior at N=28 in Ca and Ni isotopes

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Schwenk, A.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Citation

Sommer, F., König, K., Rossi, D. M., Everett, N., Garand, D., de Groote, R. P., et al. (2022). Charge radii of ^55,56Ni reveal a surprisingly similar behavior at N=28 in Ca and Ni isotopes. Physical Review Letters, 129(13): 132501. doi:10.1103/PhysRevLett.129.132501.

Cite as: https://hdl.handle.net/21.11116/0000-000C-04AE-C

Abstract

Nuclear charge radii of $^{55,56}$Ni were measured by collinear laser
spectroscopy. The obtained information completes the behavior of the charge
radii at the shell closure of the doubly magic nucleus $^{56}$Ni. The trend of
charge radii across the shell closures in calcium and nickel is surprisingly
similar despite the fact that the $^{56}$Ni core is supposed to be much softer
than the $^{48}$Ca core. The very low magnetic moment
$\mu(^{55}\mathrm{Ni})=-1.108(20)\,\mu_N$ indicates the impact of M1
excitations between spin-orbit partners across the $N,Z=28$ shell gaps. Our
charge-radii results are compared to \textit{ab initio} and nuclear density
functional theory calculations, showing good agreement within theoretical
uncertainties.