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N=14 and 16 shell gaps in neutron-rich oxygen isotopes
KTH, Superseded Departments, Physics.
KTH, School of Engineering Sciences (SCI), Physics.
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Number of Authors: 46
2004 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 69, no 3Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2004. Vol. 69, no 3
Keyword [en]
projectile fragmentation, magic number, drip-line, nuclei, spectroscopy, model, stability, state, n=20, o-28
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-23298DOI: 10.1103/PhysRevC.69.034312ISI: 000220607200040Scopus ID: 2-s2.0-2442543519OAI: oai:DiVA.org:kth-23298DiVA: diva2:341996
Note
QC 20100525 QC 20111027. Author count 46Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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