Swelling of doubly magic ${}^{48}$Ca core in Ca isotopes beyond $N=28$

Abstract

Interaction cross sections for ${}^{42\text{-}51}$Ca on a carbon target at 280 MeV/nucleon have been measured for the first time. The neutron number dependence of derived root-mean-square matter radii shows a significant increase beyond the neutron magic number $N=28$. Furthermore, this enhancement of matter radii is much larger than that of the previously measured charge radii, indicating a novel growth in neutron skin thickness. A simple examination based on the Fermi-type distribution, and the Mean-Field calculations point out that this anomalous enhancement of the nuclear size beyond $N=28$ results from an enlargement of the core by a sudden increase in the surface diffuseness of the neutron density distribution, which implies the swelling of the bare ${}^{48}$Ca core in Ca isotopes beyond $N=28$.

arXiv comment6 pages, 3 figures

References in corpus (13)

• Unexpectedly large charge radii of neutron-rich calcium isotopes
• Electric dipole polarizability of ${}^{48}$Ca and implications for the neutron skin
• Systematic analysis of reaction cross sections of carbon isotopes
• Analysis of bulk and surface contributions in the neutron skin of nuclei
• Exploring the anomaly in the interaction cross section and matter radius of 23O
• Why is lead so kinky?
• Ground-State Electromagnetic Moments of Calcium Isotopes
• Irregularities in nuclear radii at magic numbers
• Charge-changing-cross-section measurements of ${}^{12-16}$C at around $45A$ MeV and development of a Glauber model for incident energies $10A-2100A$ MeV
• Evidence for Z=6 `magic number' in neutron-rich carbon isotopes
• Influence of the single-particle structure on the nuclear surface and the neutron skin
• Neutron-skin thickness determines the surface tension of a compressible nuclear droplet
• Direct determination of the neutron skin thicknesses in ${}^{40,48}$Ca from proton elastic scattering at $E_p=295$ MeV

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