Shell evolution in neutron-rich carbon isotopes: Unexpected enhanced role of neutron-neutron correlation
2012 (English)In: Nuclear Physics A, ISSN 0375-9474, Vol. 883, 25-34 p.Article in journal (Refereed) Published
Full shell-model diagonalization has been performed to study the structure of neutron-rich nuclei around C-20. 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 neutron monopole terms, V-d5/2d5/2(nn) and V-s1/2s1/2(nn) 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 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(E2) value in the nucleus C-20 which has been measured recently.
Place, publisher, year, edition, pages
2012. Vol. 883, 25-34 p.
Shell model, Shell evolution, N=14 shell, Carbon isotopes
IdentifiersURN: urn:nbn:se:kth:diva-98324DOI: 10.1016/j.nuclphysa.2012.04.003ISI: 000304628900002ScopusID: 2-s2.0-84859931609OAI: oai:DiVA.org:kth-98324DiVA: diva2:537172
FunderSwedish Research Council, 623-2009-7340 621-2010-4723
QC 201206262012-06-262012-06-252012-06-26Bibliographically approved