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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).

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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 :
AuthorsEmailORCID
Stanoiu, MUNSPECIFIEDUNSPECIFIED
Azaiez, FUNSPECIFIEDUNSPECIFIED
Dombradi, ZUNSPECIFIEDUNSPECIFIED
Sorlin, OUNSPECIFIEDUNSPECIFIED
Brown, B AUNSPECIFIEDUNSPECIFIED
Belleguic, MUNSPECIFIEDUNSPECIFIED
Sohler, DUNSPECIFIEDUNSPECIFIED
Saint-Laurent, M GUNSPECIFIEDUNSPECIFIED
Lopez-Jimenez, M JUNSPECIFIEDUNSPECIFIED
Penionzhkevich, Y EUNSPECIFIEDUNSPECIFIED
Sletten, GUNSPECIFIEDUNSPECIFIED
Achouri, N LUNSPECIFIEDUNSPECIFIED
Angelique, J CUNSPECIFIEDUNSPECIFIED
Becker, FUNSPECIFIEDUNSPECIFIED
Borcea, CUNSPECIFIEDUNSPECIFIED
Bourgeois, CUNSPECIFIEDUNSPECIFIED
Bracco, AUNSPECIFIEDUNSPECIFIED
Daugas, J MUNSPECIFIEDUNSPECIFIED
Dlouhy, ZUNSPECIFIEDUNSPECIFIED
Donzaud, CUNSPECIFIEDUNSPECIFIED
Duprat, JUNSPECIFIEDUNSPECIFIED
Fulop, ZUNSPECIFIEDUNSPECIFIED
Guillemaud-Mueller, DUNSPECIFIEDUNSPECIFIED
Grevy, SUNSPECIFIEDUNSPECIFIED
Ibrahim, FUNSPECIFIEDUNSPECIFIED
Kerek, AUNSPECIFIEDUNSPECIFIED
Krasznahorkay, AUNSPECIFIEDUNSPECIFIED
Lewitowicz, MUNSPECIFIEDUNSPECIFIED
Leenhardt, SUNSPECIFIEDUNSPECIFIED
Lukyanov, SUNSPECIFIEDUNSPECIFIED
Mayet, PUNSPECIFIEDUNSPECIFIED
Mandal, SUNSPECIFIEDUNSPECIFIED
van der Marel, HUNSPECIFIEDUNSPECIFIED
Mittig, WUNSPECIFIEDUNSPECIFIED
Mrazek, JUNSPECIFIEDUNSPECIFIED
Negoita, FUNSPECIFIEDUNSPECIFIED
De Oliveira-Santos, FUNSPECIFIEDUNSPECIFIED
Podolyak, Zz.podolyak@surrey.ac.ukUNSPECIFIED
Pougheon, FUNSPECIFIEDUNSPECIFIED
Porquet, M GUNSPECIFIEDUNSPECIFIED
Roussel-Chomaz, PUNSPECIFIEDUNSPECIFIED
Savajols, HUNSPECIFIEDUNSPECIFIED
Sobolev, YUNSPECIFIEDUNSPECIFIED
Stodel, CUNSPECIFIEDUNSPECIFIED
Timar, JUNSPECIFIEDUNSPECIFIED
Yamamota, AUNSPECIFIEDUNSPECIFIED
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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