Journal
PHYSICS LETTERS B
Volume 672, Issue 1, Pages 17-21Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2008.12.066
Keywords
Neutron spectroscopy; Exotic nuclei; Magic numbers; Shell gap
Funding
- National Science Foundation [PHY-0110253, PHY-0354920, PHY-0456463, PHY-0502010, PHY-0555366, PHY-0555445, PHY-0555488, PHY-0606007]
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The decay energy spectrum for neutron unbound states in O-24 (Z = 8, N = 16) has been observed for the first time. The resonance energy of the lowest lying state, interpreted as the 2(+) level, has been observed at a decay energy above 600 keV. The resulting excitation energy of the 2(+) level above 4.7 MeV. supplies strong evidence that O-24 is a doubly magic nucleus. The data is also consistent with the presence of a second excited state around 5.33 MeV which can be interpreted as the 1(+) level. (C) 2009 Elsevier B.V. All rights reserved.
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