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

Stanoiu, M, Azaiez, F, Dombradi, Z, Sorlin, O, Brown, B A, Belleguic, M, Sohler, D, Saint-Laurent, M G, Lopez-Jimenez, M J, Penionzhkevich, Y E, Sletten, G, Achouri, N L, Angelique, J C, Becker, F, Borcea, C, Bourgeois, C, Bracco, A, Daugas, J M, Dlouhy, Z, Donzaud, C, Duprat, J, Fulop, Z, Guillemaud-Mueller, D, Grevy, S, Ibrahim, F, Kerek, A, Krasznahorkay, A, Lewitowicz, M, Leenhardt, S, Lukyanov, S, Mayet, P, Mandal, S, van der Marel, H, Mittig, W, Mrazek, J, Negoita, F, De Oliveira-Santos, F, Podolyak, Z, Pougheon, F, Porquet, M G, Roussel-Chomaz, P, Savajols, H, Sobolev, Y, Stodel, C, Timar, J and Yamamota, A (2004) N=14 and 16 Shell Gaps in Neutron-Rich Oxygen Isotopes Physical Review C, 69 (3). ISSN 0556-2813

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Abstract

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.

Item Type: Article
Additional Information: Published in <i>Physical Review C,</i> Vol. 69, Iss. 3. Copyright 2004 American Physical Society. Click <a href=http://prc.aps.org/>here</a> to access the journal's website.
Divisions: Faculty of Engineering and Physical Sciences > Physics
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:07
Last Modified: 23 Sep 2013 18:26
URI: http://epubs.surrey.ac.uk/id/eprint/250

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