V.I. Zhaba. 
Approximation of scattering phases for Reid93 potential //
International Journal of Advanced Research in Physical Science (IJARPS) – 2018. – Vol. 5, No. 8. – P. 1-6.

Abstract: 
For a single-channel nucleon-nucleon scattering, a well-known and convenient variable phase approach is considered, which is widely used for practical problems of atomic and nuclear physics. 
Approximation of the pp- and np- scattering phases obtained for the modern realistic phenomenological nucleon-nucleon potential Reid93 was carried out. 
The approximation function is used as a well-known formula for a parabolic-type quadratic function.