Correlation among low-energy three-nucleon observables

We reconsider the $\frac{N}{D}$ equations for the $s$-wave spin-doublet trinucleon system and provide an alternative analytic model solution to these equations, which clearly explains most of the low energy properties of this system. The present model solution, is simpler than the previous approximate solutions proposed by other authors, and it provides a better understanding of the various lowenergy correlations for this system including the linear correlation between trinucleon energies and the neutron-deuteron scattering length.