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The cross-sections of (p,n) medium elements reactions as a function of proton energies such as  45 Sc(p,n) 45 Ti,  48 Ti(p,n) 48 V,  51 V(p,n) 51 Cr,  52 Cr(p,n) 52 Mn,  55 Mn(p,n) 55 Fe,  56 Fe(p,n) 56 Co,  59 Co(p,n) 59 Ni,  62 Ni(p,n) 62 Cu,  63 Cu(p,n) 63 Zn, and  66 Zn(p,n) 66 Ga have been interpolated near threshold up to 10 MeV in step of 0.05 MeV using MATLAB program. Weighted averages of cross-sections have been used to calculate the astrophysical S-factor and thermonuclear reaction rates as a function of the center of mass energy, E c.m.  and T 9  respectively. Polynomial expressions have been used to fit the calculated astrophysical S-factor and thermonuclear reaction rates to determine the astrophysical S-factor at various Ec.m. and thermonuclear reaction rates at various T 9  from best fitting equations with minimum Chi-Square. Empirical formulae of reactions set  45 Sc(p,n) 45 Ti,  48 Ti(p,n) 48 V,  55 Mn(p,n) 55 Fe,  59 Co(p,n) 59 Ni,  66 Zn(p,n) 66 Ga and reactions set  48 Ti(p,n) 48 V,  51 V(p,n) 51 Cr,  59 Co(p,n) 59 Ni,  63 Cu(p,n) 63 Zn,  66 Zn(p,n) 66 Ga have been used to calculate the astrophysical S-factor as a function of Ec.m. and Z and thermonuclear reaction rates as a function of T 9  and Z of target nucleus. The results have been compared with the adopted data that have been calculated from the fitting equations which have a good agreement.

Calculation of Astrophysical S-factor and Thermonuclear Reaction Rates for (p,n) Medium Elements Reactions