Vertex part T → d + n and its correlations with the triton binding energy and the doubling energy and the doublet nd-scattering length

The asymptotic normalization constant CT2 of triton is calculated in a two-body potential model with potentials having a Yukawa-type short-distance behavior and asymptotics V(r) → const r-ν exp(-μr), where ν 0, 1, 2. It is shown that CT2 decreases monotonically, while ν increases. The value of CT2 monotonically declines with rising of the product (a2k), where a2 is the doublet scattering length and k is the triton wave number. Such a behavior is in accordance with the effective range theory, taking k ctg δ pole into account, and with the general trend of the Faddeev calculation results. However, it is shown that some earlier N/D-method calculations give the opposite result: a sharp increase of CT2. The T → d + n-vertex-form-factor model calculations are compared with the known three-body result