dorsal/arxiv
View SchemaMagicity and occurrence of band with enhanced B(E2) in neutron-rich nuclei 68Ni and 90Zr
| Authors | K. Kaneko, M. Hasegawa, T. Mizusaki, Y. Sun |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0607063 |
| URL | https://arxiv.org/abs/nucl-th/0607063 |
| DOI | 10.1103/PhysRevC.74.024321 10.1103/PhysRevC.74.049901 |
| Journal | Phys.Rev.C74:024321,2006; Erratum-ibid.C74:049901,2006 |
Abstract
Experimental energy spectrum and B(E2) values in 68Ni and 90Zr indicate a double-magic character in these neutron-rich nuclei with N or Z=40. The data nevertheless do not show any pronounced irregularity in two-nucleon separation energy. To understand the underlying physics, we carry out both shell-model and mean-field calculations. The shell-model calculation can well reproduce all the observations. It is understood from the mean-field results for 68Ni that the shell gap at N=40 disappears due to dynamical correlations of the isovector J=0 pairing interaction. In 90Zr, however, such a dynamic process with the J=0 pairing appears not important because of the strong contribution of the J>0 interaction. We study also level schemes in the Ni isotopes and N=50 isotones. We predict a new band built on the $0_{2}^{+}$ state in both 68Ni and 90Zr. The states of this band are dominated by two-particle-two-hole excitations from the fp-shell to the intruder g_{9/2} orbit.
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"abstract": "Experimental energy spectrum and B(E2) values in 68Ni and 90Zr indicate a\ndouble-magic character in these neutron-rich nuclei with N or Z=40. The data\nnevertheless do not show any pronounced irregularity in two-nucleon separation\nenergy. To understand the underlying physics, we carry out both shell-model and\nmean-field calculations. The shell-model calculation can well reproduce all the\nobservations. It is understood from the mean-field results for 68Ni that the\nshell gap at N=40 disappears due to dynamical correlations of the isovector J=0\npairing interaction. In 90Zr, however, such a dynamic process with the J=0\npairing appears not important because of the strong contribution of the J\u003e0\ninteraction. We study also level schemes in the Ni isotopes and N=50 isotones.\nWe predict a new band built on the $0_{2}^{+}$ state in both 68Ni and 90Zr. The\nstates of this band are dominated by two-particle-two-hole excitations from the\nfp-shell to the intruder g_{9/2} orbit.",
"arxiv_id": "nucl-th/0607063",
"authors": [
"K. Kaneko",
"M. Hasegawa",
"T. Mizusaki",
"Y. Sun"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.74.024321 10.1103/PhysRevC.74.049901",
"journal_ref": "Phys.Rev.C74:024321,2006; Erratum-ibid.C74:049901,2006",
"title": "Magicity and occurrence of band with enhanced B(E2) in neutron-rich nuclei 68Ni and 90Zr",
"url": "https://arxiv.org/abs/nucl-th/0607063"
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