EFFECT OF EXCESS TARGET NUCLEONS ON THE MAIN FEATURES OF EXCITATION FUNCTIONS FOR SOME PROTON INDUCED REACTIONS DEPENDING ON ALICE-IPPE CALCULATIONS

Proton induced nuclear reactions at low proton energies are commonly used for production of radioactive isotopes which are important for many different applications. The production yield depends on excitation function features for the used nuclear reaction. In this work the excitation functions for more than 80 protons induced nuclear reactions were constructed using the ALICE-IPPE code which depends on the pre-equilibrium model. Four groups of different isotopes were chosen to study the effect of the excess target neutrons on the threshold energy (Ethr), maximum reaction cross section (σmax) and the energy at maximum cross section (Emax). The selected groups were the natural isotopes of Ti, Cr, Fe and Ni. For the study of the effect of excess target protons on the same previous parameters, the excitation functions for the reactions on the isotones group 54Cr, 55Mn, 56Fe and 58Ni were performed at the same proton energy range. In order to understand the effect of the neutron to proton ratio on the previously mentioned parameters, proton reactions on the group of isobars 50Ti, 50V and 50Cr had been studied. In each case three protons induced reactions were undertaken, manly (p,n), (p,2n) and (p,3n). Each of the three previously mentioned parameters for each reaction were tabulated as a function of the excess number of nucleons and curve fit were constructed in order to get some phenomenological formulae for the behavior of these parameters.