AN ESTIMATE OF CROSS-SECTION OF PHOTO-PROTON REACTIONS ON Ti47-50 ISOTOPES

Development of technology of isotope production at an electron accelerator, in particular Sc-47 by the Ti-48(gamma,p)(47) Sc reaction, requires accurate data on cross-sections of this and other photo-proton reactions on the titanium isotopes, as the available data are characterized by considerable scatter. A simple technique for estimating maximum and width of the excitation function of a reaction with dominating giant dipole resonance was proposed and validated earlier. The method is based on measurement of normalized reaction yield in a thin target, overlapping completely a flux of X-rays, and processing of data obtained with the use of a developed analytical model. The joint activation of foils from natural nickel, molybdenum and titanium by bremsstrahlung radiation with end-point photon energy in the range 40.95 MeV was carried out. The characteristics of the reactions Ti-48(gamma,p)Sc-47, Ti-49(gamma,p)Sc-48, Ti-50(gamma,np)Sc-48, Ti-47(gamma,p)Sc-46, and Ti-48(gamma,np)Sc-46 are studied by new technique. For verifying results, the well-examined Ni-58(gamma,n)Ni-57 and Mo-100(gamma,n)Mo-99 reactions, taking place in the nickel and molybdenum foils, are used.