Evidence for a Doubly Magic O-24
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.
Published in: Physics Letters B, Volume 672, Issue 1, February 9, 2009, pages 17-21. Copyright © 2009 Elsevier Science BV, Amsterdam. The final published version is available at: http://dx.doi.org/10.1016/j.physletb.2008.12.066