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Low-lying neutron fp-shell intruder states in 27Ne

S. M. Brown et al.
Phys. Rev. C 85, 011302(R) – Published 23 January 2012

Abstract

The quenching of the N=20 shell gap in neutron-rich nuclei is investigated by studying the single-particle structure of 27Ne via neutron transfer using a 26Ne beam. Two low-lying negative-parity intruder states have been observed, the lowest of which is identified as Jπ=3/2, confirming earlier speculations. A level identified as 7/2 is observed higher in energy than the 3/2, contrary to the ordering at β-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)-ω 0s-0p-0d-1s-0f-1p calculations in which there is a significant ad hoc reduction (0.7 MeV) in the N=20 shell gap.

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  • Received 7 April 2011

DOI:https://doi.org/10.1103/PhysRevC.85.011302

©2012 American Physical Society

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Vol. 85, Iss. 1 — January 2012

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