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Expérience GANIL, Dispositif SISSI, détécteur SPEGThe structure of $^{17-20}_{6}$C nuclei was investigated by means of the in-beam $\gamma$-ray spectroscopy technique using fragmentation reactions of radioactive beams. Based on particle-$\gamma$ and particle-$\gamma\gamma$ coincidence data, level schemes are constructed for the neutron rich $^{17-20}$C 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

physical review. c. nuclear physics/physical review. c, nuclear physics

Disappearance of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>14</mml:mn></mml:mrow></mml:math>shell gap in the carbon isotopic chain

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