N = 14 and 16 shell gaps in neutron-rich oxygen isotopes
2004; American Institute of Physics; Volume: 69; Issue: 3 Linguagem: Inglês
10.1103/physrevc.69.034312
ISSN1538-4497
AutoresM. Stănoiu, F. Azaiez, Zs. Dombrádi, O. Sorlin, B. A. Brown, M. Belléguic, D. Sohler, M. G. Saint Laurent, M. J. López-Jiménez, Yu. É. Penionzhkevich, G. Sletten, N. L. Achouri, J. C. Angélique, F. Becker, C. Borcea, C. Bourgeois, A. Bracco, J. M. Daugas, Z. Dlouhý, C. Donzaud, J. Duprat, Zs. Fülöp, D. Guillemaud-Mueller, S. Grévy, F. Ibrahim, A. Kerek, A. Krasznahorkay, M. Lewitowicz, S. Leenhardt, S. M. Lukyanov, P. Mayet, S. Mandal, H. van der Marel, W. Mittig, J. Mrázek, F. Negoiţă, F. De Oliveira-Santos, Zs. Podolyák, F. Pougheon, M. G. Porquet, P. Roussel‐Chomaz, H. Savajols, Yu. G. Sobolev, C. Stödel, J. Tímár, A. Yamamoto,
Tópico(s)Astro and Planetary Science
ResumoIn-beam γ-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, γ-ray energies, intensities, and γ−γ coincidences have been measured. Based on this information new level schemes are proposed for O21,22 up to the neutron separation energy. The nonobservation of any γ-decay branch from O23 and O24 suggests that their excited states lie above the neutron decay thresholds. From this, as well as from the level schemes proposed for O21 and O22, the size of the N=14 and 16 shell gaps in oxygen isotopes is discussed in the light of shell-model calculations.5 MoreReceived 23 September 2003DOI:https://doi.org/10.1103/PhysRevC.69.034312©2004 American Physical Society
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