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Study of drip line nuclei through two-step fragmentation

Authors:	M Stanoiu F Azaiez F Becker M Belleguic C Borcea C Bourgeois B A Brown Z Dlouhý Z Dombrádi Z Fülöp H Grawe S Grévy F Ibrahim A Kerek A Krasznahorkay M Lewitowicz S Lukyanov H van der Marel P Mayet J Mrázek S Mandal D Guillemaud-Mueller F Negoita Y E Penionzhkevich Z Podolyák P Roussel-Chomaz M G Saint Laurent H Savajols O Sorlin G Sletten D Sohler J Timár C Timis A Yamamoto

Institution:	(1) GANIL BP 55027, 14076 Caen Cedex 5, France;(2) Institut de Physique Nucléaire, IN2P3-CNRS, F-91406 Orsay Cedex, France;(3) Department of Physics, University of Surrey, GU2 5XH Guildford, England;(4) IFIN-HH PO-BOX MG-6, 76900 Bucharest, Magurele, Romania;(5) NSCL, MI 48824-1321 East Lansing, USA;(6) Nuclear Physics Institute, 25068 Rez, Czech Republic;(7) Institute of Nuclear Research, P.O. Box 51, H-4001 Debrecen, Hungary;(8) Laboratoire de Physique Corpusculaire, 14000 Caen Cedex, France;(9) Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, Dubna, Russia;(10) GSI, Postfach 110552, D-64220 Darmstadt, Germany;(11) Niels Bohr Institute, University of Copenhagen, Denmark;(12) Royal Institute of Technology, Stockolm, Sweden

Abstract:	We have studied the structure of light neutron-rich nuclei around N = 16 by employing the in-beam $\gamma$ -ray spectroscopy technique using the fragmentation of secondary beams of ^25,26Ne, ^27,28Na and ^29,30Mg isotopes. This secondary-beam cocktail was obtained by the fragmentation of a ³⁶S beam at 77.5 MeV $\cdot A$ by the SISSI/GANIL facility. By a second-step fragmentation, we have measured $\gamma$ -ray-residue coincidences in ^17-20C and ^23,24O and described the obtained levels in the framework of the shell model.Received: 31 October 2002, Published online: 24 February 2004PACS: 23.20.Lv $\gamma$ transitions and level energies - 21.60.Cs Shell model - 27.20. + n $6 \leq A \leq 19$ - 27.30. + t $20 \leq A \leq 38$

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