Cross sections of natSb(p,x) reactions for 30–46 MeV protons

In order to optimize the production of 118Te in thick targets for use in a 118Te/ 118Sb radionuclide generator, the excitation function for the 121Sb(p,4n) 118Te reaction has been measured for 30–46 MeV protons. The excitation functions for the competing reactions natSb(p,xn) 119mTe, natSb(p,xn) 119Te, natSb(p,xn) 121mTe, natSb(p,pxn) 120mSb and 123Sb(p,pn) 122Sb have also been determined using stacked foil techniques. The 121Sb(p,4n) 118Te reaction cross section maximum was found to be 480 mbarn at 44 MeV. In order to minimize the 119m + 119Te interference a minimum proton beam energy of 40 MeV is required. The cross section results are compared with published data and with calculated excitation functions.