Disappearance of the N=14 shell gap in the carbon isotopic chain

M. Stanoiu et al.
Phys. Rev. C 78, 034315 – Published 23 September 2008

Abstract

The structure of 61720C nuclei was investigated by means of the in-beam γ-ray spectroscopy technique using fragmentation reactions of radioactive beams. Based on particle-γ and particle-γγ coincidence data, level schemes are constructed for the neutron-rich C1720 nuclei. The systematics of the first excited 2+ states in the carbon isotopes is extended for the first time to A=20 showing that in contrast to the case of the oxygen isotopes, the N=14 subshell closure disappears. Experimental results are compared with shell-model calculations. Agreement between them is found only if a reduced neutron-neutron effective interaction is used. Implications of this reduced interaction in some properties of weakly bound neutron-rich Carbon are discussed.

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  • Received 5 June 2008

DOI:https://doi.org/10.1103/PhysRevC.78.034315

©2008 American Physical Society

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Vol. 78, Iss. 3 — September 2008

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