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Radial and orbital decomposition of charge radii of Ca nuclei:Comparative study of Skyrme and Fayans functionals

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arXiv:2404.13635v1 Announce Type: new
Abstract: We investigate the charge and point-proton radii of the Ca nuclei in detail in the density functional theory framework. As the Fayans energy density functional provides characteristic $N$-dependence, successfully describing the parabolic behavior of the differential charge radii in $20\leq N\leq 28$, we pose our particular focus on its physics origin, by decomposing them into the radial and orbital contributions. The results are compared with those from the Skyrme plus usual pairing functional, which is taken as a representative of the functionals having normal pairing channels. We point out that, because the enhancement of the differential charge radii in $N<20$ with the Fayans functional, which is contradictory with the data, has the origin parallel to the parabolic behavior in $20\leq N\leq 28$, it is significant to describe both $N$ regions simultaneously.

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