Abstract
The quenching of the shell gap in neutron-rich nuclei is investigated by studying the single-particle structure of Ne via neutron transfer using a Ne beam. Two low-lying negative-parity intruder states have been observed, the lowest of which is identified as , confirming earlier speculations. A level identified as 7/2 is observed higher in energy than the 3/2, contrary to the ordering at -stability and at an energy significantly different from the predictions of previous shell-model calculations. The measured energies and deduced spectroscopic factors are well reproduced in full (0,1)- ----- calculations in which there is a significant ad hoc reduction ( MeV) in the shell gap.
- Received 7 April 2011
DOI:https://doi.org/10.1103/PhysRevC.85.011302
©2012 American Physical Society