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Title: Shape coexistence at N=20 and N=28: Study of 0{sub 2}{sup +} states in {sup 34}Si and {sup 44}S

It is well known that the nuclear shell structure changes for the most exotic nuclei. One of the consequences of this phenomenon is the modification of the 'classical' magic numbers, as experimentally observed at N = 20 and N = 28. Nevertheless, the mechanisms responsible for such changes are still under discussion and more experimental information is needed to better constrain the theoretical models. In these proceedings, we report on the discovery and the experimental study by precise spectroscopy experiments of the 0{sub 2}{sup +} state in {sup 34}Si and {sup 44}S. The {sup 34}Si is located between the magic spherical {sup 36}S and the deformed {sup 32}Mg, member of the so-called island of inversion, whereas {sup 44}S is located between the magic spherical {sup 48}Ca and the deformed {sup 42}Si. Therefore, the structure of these nuclei, and in particular the phenomenon of shape coexistence, is of crucial importance to understand how the intruder configurations progressively dominate the ground state structure of the most exotic nuclei at both N = 20 and N = 28.
Authors:
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  1. Centre d'Etudes Nucléaire de Bordeaux Gradignan, CNRS/IN2P3, Chemin du Solarium, 33175 Gradignan Cedex (France)
  2. Horia Hulubei National Institute for Physics and Nuclear Engineering, IFIN-HH, P.O.B. MG-6, 077125 Magurele (Romania)
  3. Nuclear Physics Institute, AS CR, CZ-25068 Rez (Czech Republic)
  4. FLNR, JINR, 141980 Dubna, Moscow region (Russian Federation)
  5. Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM - CNRS/IN2P3, Bd Henri Becquerel, BP 55027, F-14076 Caen Cedex 5 (France)
Publication Date:
OSTI Identifier:
22308432
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1609; Journal Issue: 1; Conference: FIG12: International conference on frontiers in gamma-ray spectroscopy 2012, New Delhi (India), 5-7 Mar 2012; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CALCIUM 48; MAGIC NUCLEI; MAGNESIUM 32; NUCLEAR STRUCTURE; SILICON 34; SILICON 42; SPECTROSCOPY; SULFUR 36; SULFUR 44