Effective Range Approximation in Variable Phase Approach for Triplet ${}^3{S}_1^{\{np\}}$ and Singlet ${}^1{S}_0^{\{nn,np,pp\}}$ State

This work is a short communication where phase function method has been applied to obtain the phase shifts using Effective Range Approximation potential for ${}^3{S}_1-np$, ${}^1{S}_0-nn$, ${}^1{S}_0-np$, and ${}^1{S}_0-pp$ states. No free fitting parameters are used in calculations and reasonably good match with the experimental phase shifts is observed for E $\le$ 20 MeV. Potentials are obtained for n-n, n-p, and p-p scattering that are exponential well-shaped.