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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
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
AuthorsEmail
Stanoiu, MUNSPECIFIED
Azaiez, FUNSPECIFIED
Dombradi, ZUNSPECIFIED
Sorlin, OUNSPECIFIED
Brown, B AUNSPECIFIED
Belleguic, MUNSPECIFIED
Sohler, DUNSPECIFIED
Saint-Laurent, M GUNSPECIFIED
Lopez-Jimenez, M JUNSPECIFIED
Penionzhkevich, Y EUNSPECIFIED
Sletten, GUNSPECIFIED
Achouri, N LUNSPECIFIED
Angelique, J CUNSPECIFIED
Becker, FUNSPECIFIED
Borcea, CUNSPECIFIED
Bourgeois, CUNSPECIFIED
Bracco, AUNSPECIFIED
Daugas, J MUNSPECIFIED
Dlouhy, ZUNSPECIFIED
Donzaud, CUNSPECIFIED
Duprat, JUNSPECIFIED
Fulop, ZUNSPECIFIED
Guillemaud-Mueller, DUNSPECIFIED
Grevy, SUNSPECIFIED
Ibrahim, FUNSPECIFIED
Kerek, AUNSPECIFIED
Krasznahorkay, AUNSPECIFIED
Lewitowicz, MUNSPECIFIED
Leenhardt, SUNSPECIFIED
Lukyanov, SUNSPECIFIED
Mayet, PUNSPECIFIED
Mandal, SUNSPECIFIED
van der Marel, HUNSPECIFIED
Mittig, WUNSPECIFIED
Mrazek, JUNSPECIFIED
Negoita, FUNSPECIFIED
De Oliveira-Santos, FUNSPECIFIED
Podolyak, Zz.podolyak@surrey.ac.uk
Pougheon, FUNSPECIFIED
Porquet, M GUNSPECIFIED
Roussel-Chomaz, PUNSPECIFIED
Savajols, HUNSPECIFIED
Sobolev, YUNSPECIFIED
Stodel, CUNSPECIFIED
Timar, JUNSPECIFIED
Yamamota, AUNSPECIFIED
Date : 1 January 2004
Identification Number : 10.1103/PhysRevC.69.034312
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.
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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