Shell erosion and shape coexistence in S-43(16)27

L. Gaudefroy, J.M. Daugas, M. Hass, S. Grevy, Ch. Stodel, J.C. Thomas, L. Perrot, M. Girod, B. Rosse, J.C. Angelique, D.L. Balabanski, E. Fiori, C. Force, G. Georgiev, D. Kameda, V. Kumar, R.L. Lozeva, I. Matea, V. Meot, P. MorelB.S. Nara Singh, F. Nowacki, G. Simpson

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Abstract

We report on the g-factor measurement of the first isomeric state in 4316S27 [Ex=320.5(5)keV, T1/2=415(5) ns, and g=0.317(4)]. The 7/2− spin-parity of the isomer and the intruder nature of the ground state of the nucleus are experimentally established for the first time, providing direct and unambiguous evidence of the collapse of the N=28 shell closure in neutron-rich nuclei. The shell model, beyond the mean-field and semiempirical calculations, provides a very consistent description of this nucleus showing that a well deformed prolate and quasispherical states coexist at low energy.
Original languageEnglish
Article number092501
Number of pages4
JournalPhysical Review Letters
Volume102
Issue number9
DOIs
Publication statusPublished - 2 Mar 2009
Externally publishedYes

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    Gaudefroy, L., Daugas, J. M., Hass, M., Grevy, S., Stodel, C., Thomas, J. C., Perrot, L., Girod, M., Rosse, B., Angelique, J. C., Balabanski, D. L., Fiori, E., Force, C., Georgiev, G., Kameda, D., Kumar, V., Lozeva, R. L., Matea, I., Meot, V., ... Simpson, G. (2009). Shell erosion and shape coexistence in S-43(16)27. Physical Review Letters, 102(9), [092501]. https://doi.org/10.1103/PhysRevLett.102.092501