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Conference on Nuclear Structure 98, Gatlinburg : États-Unis (1998)
In-beam gamma spectroscopy of very neutron-rich nuclei at GANIL
F. Azaiez1, M. Belleguic1, O. Sorlin1, S. Leenhardt1, C. Bourgeois1, C. Donzaud1, J. Duprat1, D. Guillemaud-Mueller1, A.C. Mueller1, F. Pougheon1, M.G. Saint-Laurent2, M.J. Lopez2, N.L. Achouri2, J.M. Daugas2, M. Lewitowicz2, W. Mittig2, F. de Oliveira2, P. Roussel-Chomaz2, H. Savajols2, Yu.E. Penionzhkevich, Yu. Sobolev, C. Borcea, M. Stanoiu, J.C. Angélique3, S. Grévy3, N.A. Orr3, I. Deloncle4, J. Kiener4, M.G. Porquet4, F. Marie5, A. Gillibert5, J.E. Sauvestre, Z. Dlouhy, W. Shuying

The structure of nuclei far from stability call be investigated by means of in-beam gamma spectroscopy using both stable and radioactive beams. A gamma -array consisting of BaF2 and Ge detectors have been used at GANIL in order to perform two of such experiments: i) Secondary beams of neutron-rich Ge, Zn and Ni isotopes around N=40 were produced from the fragmentation of a primary /sup 86/Kr beam, and analyzed by means of the LISE3 spectrometer. For the transitions between the 0/sup +/ ground state and the first 2/sup +/ state, B(E2) values have been extracted from Coulomb excitation cross-section measurement. Some of the obtained results related to the effectiveness of the N=40 spherical sub-shell closure as well as future improvements of the quality of the data are discussed. ii) In-beam gamma -spectroscopy of neutron-rich nuclei around /sup 32/Mg produced by fragmentation of /sup 36/S have been recently performed Gamma decay of relatively higher excited states have been measured in a large number of exotic light nuclei. Preliminary results obtained in a number of even-even nuclei around N=20, such as /sup 20,22/O, /sup 26,28/Ne and /sup 30,32/Mg are presented.
1 :  IPNO - Institut de Physique Nucléaire d'Orsay
2 :  GANIL - Grand Accélérateur National d'Ions Lourds
3 :  LPCC - Laboratoire de Physique Corpusculaire de Caen
4 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
5 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
structure nucléaire
Physique/Physique Nucléaire Expérimentale