Study of proton induced reactions in a radioactive [sup 129]I target at E[sub p]=660 MeV

Two NaI (85% {sup 129}I and 15% {sup 127}I) targets were exposed to a beam of 660-MeV protons. Cross sections for formation of 76 residual nuclei were obtained by the induced activity method. The results are compared with other experimental data on {sup 127}I and theoretical calculations by eleven models contained fin the codes LAHET3 (using the Bertini+Dresner, ISABEL+Dresner, INCL-Dresner, and INCL-ABLA options), CASCADE, CEM95, CEM2K, LAQGSM+GEM2, LAQGSM+GEMINI, and CEM2k+GEMINI. Most of the models describe spallation products with masses close to the target reasonably well while the reliability of the codes differs greatly in the deep spallation and fission/fragmentation regions. The difficulties in describing products with A = 40-80 by all of the codes tested here except for CEM2k+GEMINI and LAQGSM+GEMINI is related to the neglect of fission (and fragmentation) processes for targets as light as {sup 129}I.