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Energies of the single-particle proton 1$$f$$ and 2$$p$$ states in the $$^{58,60,62,64}$$Ni isotopes

Bespalova, O. V.*; Boboshin, I. N.*; Varlamov, V. V.*; Ermakova, T. A.*; Ishkhanov, B. S.*; Komarov, S. Yu.*; Koura, Hiroyuki   ; Romanovskii, E. A.*; Spasskaya, T. I.*

Single-particle energies corresponding to the maximum value of the spectroscopic factor were obtained for the proton states near the Fermi energy in the $$^{58,60,62,64}$$Ni nuclei by the joint evaluation of the data on the stripping and pickup reactions on the same nucleus. These results are compared with the center-of-mass energies of the single-particle state fragment distributions obtained by the same method and with the single-particle energies calculated with the Woods-Saxon-like potential and with the dispersive optical model potential. For 2$$p$$$$_{3/2}$$ states (the first unoccupied states), Results of the Woods-Saxon-like potential are in excellent agreement with the energies of maximum (practically the same), for 1$$f$$$$_{7/2}$$, 1$$f$$$$_{5/2}$$ and for 2$$p$$$$_{1/2}$$ states the agreement within 1 - 1.5 MeV was achieved. Sufficient difference between centers of mass and maximums was obtained for 1$$f$$$$_{5/2}$$ and 2$$p$$$$_{1/2}$$ states, which may be connected with the fragmentation effect.

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