1. Shape coexistence and the N = 20 shell closure far from stability by inelastic scattering
- Author
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V. Lapoux, A. Gillibert, H. Savajols, J. M. Casandjian, A. Drouart, J. A. Scarpaci, C. E. Demonchy, Y. E. Penionzhkevich, Z. Dlouhý, F. Sarazin, W. Mittig, C. Jouanne, A.V. Belozyorov, D. Baiborodin, N. Alamanos, E. C. Pollacco, P. Roussel-Chomaz, J. Mrazek, A. Korichi, and S. M. Lukyanov
- Subjects
Physics ,Nuclear and High Energy Physics ,education.field_of_study ,010308 nuclear & particles physics ,Hadron ,Population ,Shell (structure) ,State (functional analysis) ,Inelastic scattering ,01 natural sciences ,Stability (probability) ,medicine.anatomical_structure ,0103 physical sciences ,medicine ,Nuclear fusion ,Atomic physics ,010306 general physics ,education ,Nucleus - 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.
- Published
- 2002