The magicity, the radii of neutron orbits 1f7/2, 2p3/2 and halo-like structure of 52,54Ca nuclei

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Resumo

The evolution of neutron single-particle spectra of isotones with N = 32 and 34 new magic neutron numbers in the region 16 ≤ Z ≤ 32 was calculated in the dispersive optical model. It was shown that the minimum of the difference between the Fermi energy and the half-sum of the energy levels of the last predominantly occupied state and the first predominantly unoccupied state is achieved in the magic isotones with N = 32 and 34. The calculated root-mean-square radius of the neutron halo-like state 2p3/2 in double magic 52Ca nucleus exceeded the radius of the underlying 1f7/2 state by 0.8 fm. It is consistent with the recent experimental data and theoretical predictions that explain ‟unexpectedly” large root-mean-square charge radius of this nucleus.

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Sobre autores

O. Bespalova

Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics

Autor responsável pela correspondência
Email: besp@sinp.msu.ru
Rússia, Moscow

A. Klimochkina

Lomonosov Moscow State University

Email: besp@sinp.msu.ru

Faculty of Physics

Rússia, Moscow

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2. Fig. 1. Experimental energies (a) and root-mean-square charge radii rch (b) of even Ca isotopes.

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3. Fig. 2. Neutron single-particle energies of isotones with N = 32. Light symbols connected by solid lines are calculations with DOP, dashed line is energy EF, dashed lines are energies –Sn(A), –Sn(A + 1). Dark symbols are the result of joint evaluation of data from neutron stripping and pickup reactions on the same nucleus [12, 13].

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4. Fig. 3. Experimental energies of isotones with N = 32 (squares) and N = 34 (circles).

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5. Fig. 4. The same as in Fig. 2 for isotones with N = 34.

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6. Fig. 5. Neutron density ρn(r) (a) and the second derivative of its logarithm (b) for the isotopes 48Ca (dashed curve), 52Ca (solid) and 54Ca (dotted).

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