In-beam gamma spectroscopy of very neutron-rich nuclei at GANIL
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- IdHAL : jean-duprat
- ORCID : 0000-0001-7408-3089
- IdRef : 116736127
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- ORCID : 0000-0003-4411-6796
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- IdHAL : francois-de-oliveira-santos
- ORCID : 0000-0003-4539-5985
- IdRef : 157826392
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- PersonId : 903877
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- PersonId : 741727
- IdHAL : herve-savajols
- ORCID : 0000-0003-0534-0920
- IdRef : 180822993
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- PersonId : 829693
- ORCID : 0000-0003-0032-2870
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- PersonId : 940479
- ORCID : 0000-0002-8499-8693
- Fonction : Auteur
- PersonId : 742159
- IdHAL : isabelle-deloncle
- IdRef : 19712898X
- Fonction : Auteur
- Fonction : Auteur
- Fonction : Auteur
Résumé
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.
