In this work, reaction cross-sections were calculated and Excitation Functions were evaluated for productions of 208 Bi, 212,211,210 At, 211,210 Po isotopes using EXIFON code in the energy range from 0 MeV to 30 MeV. The code is based on an analytical model for statistical multistep direct and multistep compound reactions (SMD/SMC model). This work also investigates the shell structure effect on the reaction cross-section, the results obtained show that the cross-sections of (a, na) reaction for both with shell correction and without shell correction are zeros at energies range considered, this shows that the energy of the incident particle is below the threshold of this reaction due to the present of coulomb repulsive force between the projectile and target nucleus.

In this work, the reaction cross-section for neutron-induced reactions on 127 I isotope was calculated using EXIFON code in the energy range of incident particle from 0 MeV to 30 MeV. The code is based on an analytical model for statistical multistep direct and multistep compound reactions (SMD/SMC model). In order to see the effect of nuclear structure on cross sections, the calculation was done using nuclear shell structure effect and without considering shell structure effect. Obtained results and statistical analysis showed that shell structure effect does not give significant changes to the cross-section at considered energy ranges. This shows that EXIFON code is a good tool for investigation of nuclear reaction cross section and is useful in the production of the radioisotopes of Iodine, Antimony and tellurium of high purity and in an efficient manner using cyclotron or nuclear reactors, these isotopes have potential application for field of medical science especially for diagnostics and therapeutic purposes.

INTRODUCTION At present day, radioisotope production for nuclear medicine is important because of its common use in tomography devices. Both single photon emissions computed tomography (SPECT) and positron emission (PET) is used for diagnosis in nuclear medicine(Ahmad and Koki, 2017) particular, the radionuclide of iodine is used for these purposes. Therefore, these radionuclides play an important role in medical applications and research. For example, Gamma-emitted short long live 124 I(Artun and Aytekin, 2015) can be used as the diagnostic image in SPECT and PET. Besides, 124 I allows for studying important organs such as the brain and heart (Alharbi & Azzam, 2012). The long isotope also is used as a source for internal radiotherapy, bone dosimetry and a biological tracer (Skakun & Qaim, 2008). Another iodine radionuclide 122 I is a very short and used in PET for brain blood studies(Qaim, 2004, Qaim, 2017 During the last two decades, several semi classical and quantum-mechanical models have been developed to treat equilibrium phase of reactions leading to the formation of the compound nucleus. The very first model is capable of reproducing the shapes of the continuous spectra 1966). He reported that "if one is overlook the justification and retain the assumption of a binary collision even at lower energies, one can qualitatively explain some ABSTRACT Radioisotope production for nuclear medicine is tomography devices. Both single photon emissions computed tomography (SPECT) and positron emission tomography (PET) is used for diagnosis in nuclear medicine we have calculated the reaction cross secti the formation of , , , particle with the nucleus of the iodine variation of interaction crossresult shows that the plots of curve. The productions confirm the presence of Xenon possible at the energy range of 0 to 30 MeV from the iodine