Abstract
Data for fission induced by pi meson beams from 80 to 500 MeV are presented for nuclei from Fe through Pu as measured by solid state track detectors. The general trends for binary fission withπ + are reproduced fairly well by a calculation in the ‘high excitation’ limit with standard level density and fission barrier parameters, butπ − data are underpredicted. A universal dependence of the binary fission probabilities with the fissility (Z±1)2/A is found to be valid for both pion beam charges for all beam energies below the delta resonance. Probabilities for observing three fragments withπ + are not reproduced by a ternary fission application of the model found to work for binary fission.
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We thank the careful work of the scanners who analyzed the track data, INC Division of Los Alamos National Laboratory for the use of their absolute11C counting system, and D.J. Ernst for his ROMPIN theoretical reaction cross sections. This work was supported in part by the USDOE and the Brazilian CNPQ, with travel support from the National Science Foundation.