@article {Yuan201225,
	title = {Shell evolution in neutron-rich carbon isotopes: Unexpected enhanced role of neutron{\textendash}neutron correlation},
	journal = {Nuclear Physics A},
	volume = {883},
	year = {2012},
	pages = {25 - 34},
	abstract = {Full shell-model diagonalization has been performed to study the structure of neutron-rich nuclei around 20C. We investigate in detail the roles played by the different monopole components of the effective interaction in the evolution of the N = 14 shell in C, N and O isotopes. It is found that the relevant neutron{\textendash}neutron monopole terms, V d 5 / 2 d 5 / 2 n n and V s 1 / 2 s 1 / 2 n n , contribute significantly to the reduction of the N = 14 shell gap in C and N isotopes in comparison with that in O isotopes. The origin of this unexpectedly large effect, which is comparable with (sometimes even larger than) that caused by the proton{\textendash}neutron interaction, is related to the enhanced configuration mixing in those nuclei due to many-body correlations. Such a scheme is also supported by the large B ( E 2 ) value in the nucleus 20C which has been measured recently.},
	keywords = {Carbon isotopes},
	issn = {0375-9474},
	doi = {http://dx.doi.org/10.1016/j.nuclphysa.2012.04.003},
	url = {http://www.sciencedirect.com/science/article/pii/S0375947412001315},
	author = {C.X. Yuan and Qi, C. and F.R. Xu}
}
