Shape coexistence and the N = 20 shell closure far from stability by inelastic scattering |
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| Authors: | W Mittig H Savajols D Baiborodin JM Casandjian CE Demonchy P Roussel-Chomaz F Sarazin Z Dlouhý J Mrazek AV Belozyorov SM Lukyanov YE Penionzhkevich N Alamanos A Drouart A Gillibert C Jouanne V Lapoux E Pollacco A Korichi JA Scarpaci |
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| Institution: | (1) GANIL (DSM/CEA, IN2P3/CNRS), BP 5027, 14076 Caen Cedex 5, France, FR;(2) Nuclear Physics Institute, ASCR, 25068 Rez, Czech Republic, CZ;(3) FLNR, JINR, Dubna, P.O. Box 79, 101 000 Moscow, Russia, RU;(4) CEA/DSM/DAPNIA/SPhN, Saclay, 91191 Gif-sur-Yvette Cedex, France, FR;(5) CSNSM, F-91405 Campus Orsay, France, FR;(6) IPN, F-91406 Orsay Cedex, France, FR |
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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.
Received: 21 March 2002 / Accepted: 16 May 2002 / Published online: 31 October 2002
RID="a"
ID="a"e-mail: mittig@ganil.fr |
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| Keywords: | PACS 21 10 Re Collective levels – 25 60 -t Reactions induced by unstable nuclei |
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