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Shape coexistence and the N = 20 shell closure far from stability by inelastic scattering

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Abstract:

Following mass measurements in the region N = 20 and N = 28, we have studied inelastic nuclear scattering for the nuclei 34Si, 33Al and 32Mg. No evidence for a low-lying shape isomeric 0+ state was found in 34Si, and an upper limit for the population cross-section could be established, rendering its existence very unlikely. A new transition was found in 33Al, that is a good candidate for a 2p-2h state and therefore a determination of the 2p-2h gap at N = 20. Inelastic nuclear scattering strongly excites 3- states, as seen in 34Si. A strong transition was found in 32Mg that should correspond to the first 3- in this nucleus, lying very low as compared to theory and systematics in this region.

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Authors and Affiliations

  1. GANIL (DSM/CEA, IN2P3/CNRS), BP 5027, 14076 Caen Cedex 5, France, France

    W. Mittig, H. Savajols, D. Baiborodin, J.M. Casandjian, C.E. Demonchy, P. Roussel-Chomaz & F. Sarazin

  2. Nuclear Physics Institute, ASCR, 25068 Rez, Czech Republic, Czech Republic

    Z. Dlouhý & J. Mrazek

  3. FLNR, JINR, Dubna, P.O. Box 79, 101 000 Moscow, Russia, Russia

    A.V. Belozyorov, S.M. Lukyanov & Y.E. Penionzhkevich

  4. CEA/DSM/DAPNIA/SPhN, Saclay, 91191 Gif-sur-Yvette Cedex, France, France

    N. Alamanos, A. Drouart, A. Gillibert, C. Jouanne, V. Lapoux & E. Pollacco

  5. CSNSM, F-91405 Campus Orsay, France, France

    A. Korichi

  6. IPN, F-91406 Orsay Cedex, France, France

    J.A. Scarpaci

Authors
  1. W. Mittig
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  2. H. Savajols
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  3. D. Baiborodin
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  4. J.M. Casandjian
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  5. C.E. Demonchy
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  6. P. Roussel-Chomaz
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  7. F. Sarazin
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  8. Z. Dlouhý
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  9. J. Mrazek
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  10. A.V. Belozyorov
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  11. S.M. Lukyanov
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  12. Y.E. Penionzhkevich
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  13. N. Alamanos
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  14. A. Drouart
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  15. A. Gillibert
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  16. C. Jouanne
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  17. V. Lapoux
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  18. E. Pollacco
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  19. A. Korichi
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  20. J.A. Scarpaci
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Additional information

Received: 21 March 2002 / Accepted: 16 May 2002 / Published online: 31 October 2002

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ID="a"e-mail: mittig@ganil.fr

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Mittig, W., Savajols, H., Baiborodin, D. et al. Shape coexistence and the N = 20 shell closure far from stability by inelastic scattering. Eur Phys J A 15, 157–160 (2002). https://doi.org/10.1140/epja/i2001-10245-5

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  • DOI: https://doi.org/10.1140/epja/i2001-10245-5

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