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.
Similar content being viewed by others
Author information
Authors and Affiliations
Additional information
Received: 26 July 2000 / Accepted: 30 August 2000
Rights and permissions
About this article
Cite this article
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
Issue Date:
DOI: https://doi.org/10.1007/s100500070053