Phys. Rev. C 78, 034315 (2008) [4 pages]Disappearance of the N=14 shell gap in the carbon isotopic chainReceived 5 June 2008; published 23 September 2008 The structure of 617-20C 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 17-20C 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. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevC.78.034315
DOI:
10.1103/PhysRevC.78.034315
PACS:
23.20.Lv, 21.60.Cs, 25.70.Mn, 27.20.+n
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