Two-neutron correlations in microscopic wave functions of He-6, He-8 and C-12
Abstract
Two-neutron densities obtained from microscopic wave functions of 6He and 8He are investigated to reveal di-neutron correlations. In particular, the comparison of the two-neutron density with the product of one-neutron densities is useful for a quantitative discussion of di-neutron correlations. The calculations show that the S=0 spatial two-neutron correlation increases at the surface of 6He(0+1) and 8He(0+2). The enhancement is remarkable in the 6He(0+1) ground state but not as prominent in the 8He(0+1) ground state. Configuration mixing of many Slater determinants is essential to describe the di-neutron correlations. Two-neutron densities in 12C wave functions with α-cluster structures are also studied.
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