Surprises at the N=20 shell closure far from stability by inelastic scattering

0185770 - UJF-V 20033089 RIV NL eng J - Journal Article
Mittig, W. - Savajols, H. - Baiborodin, Dmitri - Casandijan, JM. - Demonchy, CE. - Roussel-Chomaz, P. - Sarazin, F. - Dlouhý, Zdeněk - Mrázek, Jaromír - Belozyrov, AV. - Lukyanov, S. M. - Penionzhkevich, Y. E.
Surprises at the N=20 shell closure far from stability by inelastic scattering.
Progress of Theoretical Physics Supplement. Roč. 146, - (2002), s. 16-22. ISSN 0375-9687
R&D Projects: GA AV ČR KSK1048102
Keywords : neutron-rich nuclei * shape coexistence
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 0.456, year: 2002

Following mass-measurements in the region N = 20 and N = 28, we have studied inelastic nuclear scattering for the nuclei Si-34, Al-33 and Mg-32. No evidence for a low lying shape isomeric 0(+) state was found in Si-34, and an upper limit for the population cross section could be established, rendering it's existence very unlikely. A new transition was found in Al-33, 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 Si-34. A strong transition was found in Mg-32 that should correspond to the first 3(-) in this nucleus, lying very low as compared to theory and systematics in this region.
Permanent Link: http://hdl.handle.net/11104/0082146