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Evolution of the N = 20 and N = 28 shell closures in neutron-rich nuclei

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Abstract:

The isospin dependence of shell closure phenomena is studied for light neutron-rich nuclei within a microscopic self-consistent approach using the Gogny force. Introducing configuration mixing, 32Mg is found to be dynamically deformed, although the N = 20 spherical shell closure persists at the mean-field level for all N = 20 isotones. In contrast, the N = 28 spherical shell closure is found to disappear for N - Z≥ 10 whereas deformed shell closures are preserved and lead to shape coexistence in 44 S. Configuration mixing shows that the ground state of this nucleus is triaxially deformed. The first 2+ excitation energy Ex = 1.46 MeV and the reduced transition probability B(E2;0+ gs→ 2+ 1)= 420 e 2 fm 4 obtained with our approach are in good agreement with experimental data.

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Received: 26 July 2000 / Accepted: 30 August 2000

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Péru, S., Girod, M. & Berger, J. Evolution of the N = 20 and N = 28 shell closures in neutron-rich nuclei. Eur Phys J A 9, 35–47 (2000). https://doi.org/10.1007/s100500070053

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  • DOI: https://doi.org/10.1007/s100500070053

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