Study Of Reaction Mechanism In P51v And P209bi Systems At Various Proton Energies

In this thesis, proton induced reactions on 51V and 209Bi have been studied for variousrnproton energies (7 - 70 MeV). Theoretical equilibrium (EQ) and pre-equilibrium (PE)rnexcitation functions are compared with experimental values. The study showed that the EQrnexcitation functions are not comparable to that of the experimental at higher energies in allrnreactions. It is also observed that neither EQ nor PE excitation functions are compatible tornthat of the experimental for 51V(p,3n) and 51V(p,4n) reactions; the cross-section peaks ofrn209Bi(p,xn) reactions increase as the number of emitting neutrons increases from one tornthree; and the cross-section values of 51V(p,n) reaction is higher than that of p+209Birnreaction at proton energies below about 20 MeV.rnBased on these observations, conclusions are drawn about the failure of the purernequilibrium reaction in its decay to explain the experimental data in the high energy tailrnportion of the excitation functions, which, however, are explained by pre-equilibriumrntheory; about the validity of Bohr‟s theory that EQ decay takes place at lower energies forrnthe lighter target (51V) and at lower and medium energies for the heavier target (209Bi); andrnabout the presence of higher probability for 51V(p,n) reaction to occur compared to that ofrnp+209Bi at proton energies below 20 MeV

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