Study of 660-MeV proton-induced reactions on 129-I.
Conference
·
OSTI ID:977905
Isotopically enriched {sup 129}I (85% {sup 129}I and 15% {sup 127}I) targets were irradiated with a beam of 660-MeV protons at the JINR DLNP Phasotron and cross sections of formation of 74 residual products were determined using the {gamma}-spectrometry method. Here, we analyze all these data using eleven different models, realized in eight codes: LAHET (Bertini, ISABEL, INCL+ABLA, and INCL+RAL options), CASCADE, CEM95, CEM2k, LAQGSM+GEM2, CEM2k+GEM2, LAQGSM+GEMINI, an d CEM2k+GEMINI, in order to validate the tested models against the expe ri mental data and to understand better the mechanisms for production of residual nuclei. We find that most of the codes are fairly reliable in predicting cross sections for nuclides not too far away in mass from the targets, but differ greatly in the deep spallation, fission, and fragmentation regions. None of the codes tested here except GEMINI allow fission of nuclei as light as iodine, therefore the best agreement with the {sup 129}I data, especially in the A=40-90 region, is shown by the codes CEM2k and LAQGSM when they are merged with GEMINI. We conclude that none of the codes tested here are able to reproduce well all these data and all of them need to be fu rther improved ; development of a better universal evaporation/fission model should be of a high priority.
- Research Organization:
- Los Alamos National Laboratory
- Sponsoring Organization:
- DOE
- OSTI ID:
- 977905
- Report Number(s):
- LA-UR-04-7360
- Country of Publication:
- United States
- Language:
- English
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