The nonlocal tensor operator S12N(ρ, ρ')

The extension of the tensor potential S12VT(r) to the case of a nonlocal interaction is shown to be VT(R, R') = S12NF(r, r') = 0.5[9(ρ.ρ')(σ1.ρσ2. ρ'+σ1.ρ'σ2.ρ)-2(σ1.σ2)]F(r, r'), where ρ=R/r. This potential has the necessary invariance properties provided that F(r, r')=F(r', r). With this potential and F(r, r') taken to have a rank-one separable form, the behaviour of the model-deuteron radius with respect to the strength of the tensor nonlocality is investigated. It is found that the model radius decreases as the tensor nonlocality becomes more attractive. This is consistent with recent work which considers only central nonlocality. (authors)