Shell evolution and its indication on the isospin dependence of the spin–orbit splitting
2013; Elsevier BV; Volume: 724; Issue: 4-5 Linguagem: Inglês
10.1016/j.physletb.2013.06.018
ISSN1873-2445
Autores Tópico(s)Nuclear Physics and Applications
ResumoThe available experimental data on shell evolution indicate that the strength of the spin–orbit single-particle potential may be enhanced in neutron-rich nuclei. We observe that such a simple scheme destroys the harmonic oscillator magic numbers N=8 and 20 and generates new magic numbers like N=6, 14, 16, 32 and 34. The traditional magic numbers like N=28 and 50 and N=14 seen in 22O are eroded in neutron-rich nuclei due to the sensitivity of larger-l orbitals to the depth of the central potential but they are more robust than the harmonic oscillator magic numbers. The N=82 shell closure persists in neutron-rich nuclei while the previously proposed shell closures like N=40 and 70 do not emerge. Both mechanisms contribute to enhancing the N=56 and 90 gaps by splitting the 1d5/2 and 0g7/2 and the 0h9/2 and 1f7/2 orbitals.
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