Article
Emergence of the N=16 shell gap in 21O
Author/s | Fernández Domínguez, B.
Thomas, J. S. Catford, W. N. Delaunay, F. Brown, S. M. Orr, N. A. Wilson, G. L. Moro Muñoz, Antonio Matías |
Department | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear |
Publication Date | 2011 |
Deposit Date | 2017-04-07 |
Published in |
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Abstract | The spectroscopy of O21 has been investigated using a radioactive O20 beam and the (d,p) reaction in inverse kinematics. The ground and first excited states have been determined to be Jπ=5/2+ and 1/2+, respectively. Two ... The spectroscopy of O21 has been investigated using a radioactive O20 beam and the (d,p) reaction in inverse kinematics. The ground and first excited states have been determined to be Jπ=5/2+ and 1/2+, respectively. Two neutron unbound states were observed at excitation energies of 4.77(10) and 6.17(11) MeV. The spectroscopic factor deduced for the lower of these, interpreted as a 3/2+ level, reveals a relatively pure (60%) 0d3/2 single-particle configuration, in good agreement with shell-model calculations that predict O26 to be unbound. The large energy difference between the 3/2+ and 1/2+ states is indicative of the emergence of the N=16 shell gap, which is estimated to be 5.1(11) MeV. For the higher-lying resonance, which has a character consistent with a spin-parity assignment of 3/2+ or 7/2-, a 0.71(22) branching ratio to the first 2+ state in O20 has been observed. |
Funding agencies | European Union (UE) National Science Foundation (NSF). United States |
Project ID. | 515768 RIDS
PHY-0758099 |
Citation | Fernández Domínguez, B., Thomas, J.S., Catford, W.N., Delaunay, F., Brown, S.M., Orr, N.A.,...,Moro Muñoz, A.M. (2011). Emergence of the N=16 shell gap in 21O. Physical Review C - Nuclear Physics, 84 (1), 011301-1-011301-5. |
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