Shell Erosion and Shape Coexistence in {sub 16}{sup 43}S{sub 27}

Journal Article · Fri Mar 06 04:00:00 EST 2009 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.102.092501· OSTI ID:21180259

Gaudefroy, L; Daugas, J M; Girod, M; Rosse, B; Meot, V; Morel, P ^[1]; Hass, M; Kumar, V ^[2]; Grevy, S; Stodel, Ch; Thomas, J C; Force, C ^[3]; Perrot, L ^[4]; Angelique, J C; Simpson, G ^[5]; Balabanski, D L ^[6]; Fiori, E; Georgiev, G; Lozeva, R L ^[7]; Kameda, D ^[8]

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1. CEA, DAM, DIF, F-91297 Arpajon (France)
2. The Weizmann Institute, 76100 Rehovot (Israel)
3. GANIL, CEA/DSM - CNRS/IN2P3, F-14076 Caen (France)
4. IPN, IN2P3-CNRS, F-91406 Orsay (France)
5. LPSC, F-38026 Grenoble (France)
6. Faculty of Physics, University of Sofia, BG-1164 Sofia (Bulgaria)
7. CSNSM, F-91404 Orsay (France)
8. RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)

We report on the g-factor measurement of the first isomeric state in {sub 16}{sup 43}S{sub 27}[E{sub x}=320.5(5) keV, T{sub 1/2}=415(5) ns, and g=0.317(4)]. The 7/2{sup -} 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.

• OSTI ID: 21180259
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 9 Vol. 102; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
GROUND STATES
ISOMERS
KEV RANGE
LANDE FACTOR
MEAN-FIELD THEORY
NEUTRON-RICH ISOTOPES
PARITY
SHELL MODELS
SPIN
SULFUR 43