Isoscalar pairing correlations by the tensor force in the ground states of 12C, 16O, 20Ne, and 32S nuclei

We investigate roles of the tensor force (TF) on the pairing correlations in the ground-state structure of C-12, O-16, Ne-20, and S-32 nuclei within a deformed BCS model. For pairing matrix elements, we exploit the Brueckner G matrix derived from the charge-dependent Bonn potential. In particular, the isoscalar (IS) neutron-proton (np) pairing is studied in detail in relation to spin-triplet even TF in the nucleon-nucleon interaction. Detailed analyses of the np pairing and possible enhancement of the IS channel are performed by focusing on roles of attractive spin-triplet even and repulsive spin-triplet odd channels in the TF for the ground states of the nuclei with some deformation. It is also shown that the TF may play a crucial role of properly interpreting the experimental data of a two-nucleon knockout reaction from C-12.

Automated summary

In this study, the roles of the tensor force on the pairing correlations in the ground-state structure of certain nuclei were investigated using a deformed BCS model and the Brueckner G matrix derived from the charge-dependent Bonn potential. The focus was on the neutron-proton pairing and the spin-triplet even tensor force, with detailed analyses on the attractive and repulsive channels. The tensor force was found to be crucial in interpreting experimental data of a two-nucleon knockout reaction from C-12.