Nuclear structure of the neutron rich ${}^{25-29}\mathrm{Ne}$ nuclei has been investigated through the in-beam γ-ray spectroscopy technique using fragmentation reactions of both stable and radioactive beams. Level schemes have been deduced for these Ne isotopes. In order to examine the importance of intruder fp configurations, they are compared to shell model calculations performed either in the restricted sd or in the larger sdpf valence space. The ${}^{25,26}\mathrm{Ne}$ and ${}^{27}\mathrm{Ne}$ nuclei were found to be in agreement with the sd shell model calculations, whereas ${}^{28}\mathrm{Ne}$ exhibits signatures of the intruder fp shell contribution.

• Received 27 October 2004

DOI:https://doi.org/10.1103/PhysRevC.72.054316