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N=14 and 16 Shell Gaps in Neutron-Rich Oxygen Isotopes

By M Stanoiu, F Azaiez, Z Dombradi, O Sorlin, B A Brown, M Belleguic, D Sohler, M G Saint-Laurent, M J Lopez-Jimenez, Y E Penionzhkevich, G Sletten, N L Achouri, J C Angelique, F Becker, C Borcea, C Bourgeois, A Bracco, J M Daugas, Z Dlouhy, C Donzaud, J Duprat, Z Fulop, D Guillemaud-Mueller, S Grevy, F Ibrahim, A Kerek, A Krasznahorkay, M Lewitowicz, S Leenhardt, S Lukyanov, P Mayet, S Mandal, H van der Marel, W Mittig, J Mrazek, F Negoita, F De Oliveira-Santos, Z Podolyak, F Pougheon, M G Porquet, P Roussel-Chomaz, H Savajols, Y Sobolev, C Stodel, J Timar and A Yamamota

Abstract

<p>In-beam gamma-ray spectroscopy using fragmentation reactions of both stable and radioactive beams has been performed in order to study the structure of excited states in neutron-rich oxygen isotopes with masses ranging from A=20 to 24. For the produced fragments, gamma-ray energies, intensities, and gamma-gamma coincidences have been measured. Based on this information new level schemes are proposed for O-21,O-22 up to the neutron separation energy. The nonobservation of any gamma-decay branch from O-23 and O-24 suggests that their excited states lie above the neutron decay thresholds. From this, as well as from the level schemes proposed for O-21 and O-22, the size of the N=14 and 16 shell gaps in oxygen isotopes is discussed in the light of shell-model calculations.</p

Year: 2004
DOI identifier: 10.1103/PhysRevC.69.034312
OAI identifier: oai:epubs.surrey.ac.uk:250

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