  Reference potential approach (RPA) is successful in obtaining inverse
potentials for weakly bound diatomic molecules using Morse function. In this
work, our goal is to construct inverse potentials for all available l-channels
of np-scattering using RPA. The Riccati-type phase equations for various
l-channels are solved using 5th order Runge-Kutta method to obtain scattering
phase shifts (SPS) in tandem with an optimization procedure to minimize mean
squared error (MSE). Interaction potentials for a total of 18 states have been
constructed using only three parameter Morse interaction model. The obtained
MSE is < 1% for 1S0 , 3P1 and 3D1 channels and < 2% for 1P1 channel and < 0.1%
for rest of the 14 channels. The obtained total scattering cross-sections at
various lab energies are found to be matching well with experimental ones. This
phase wave analysis study of all channels of np-scattering using RPA has been
undertaken using Morse function as zeroth reference, by us, is for the first
time.
