Abstract
The previously published INDEX model is tested for nucleon spectra fromp- andα-induced reactions. The results of two alternative versions, the INCLUSIVE INDEX model and the EXCLUSIVE INDEX model, quite well agree with the data. It is found that in the INCLUSIVE INDEX model three preequilibrium stages are sufficient to describe single- and multi-nucleon emission. The model provides an useful first order estimate of the influence of the finite Fermi energy on particle spectra. This effect is very strong for nucleon induced reactions while forα-induced reactions it can be neglected. The deduced mean-free-path multiplier corroborates the long stated discrepancy between models in which excitons interact independently or not. Using preequilibrium parameters similar to those found for nucleon induced reactions the important branching ratio of contributingnp andpp pairs in stoppedπ −-absorption can be determined by INDEX model calculations. Deduced values from publishedn- andp-spectra agree reasonably well with those of other experimental analyses but deviate significantly from microscopic model predictions.
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Dedicated to Professor Theo Mayer-Kuckuk on the occasion of his 60th birthday
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Ernst, J., Friedland, W. & Stockhorst, H. Analysis of inclusive nucleon spectra fromp- andα-induced reactions in the frame of the INDEX model, and implications for stopped π−-induced reactions. Z. Physik A - Atomic Nuclei 328, 445–453 (1987). https://doi.org/10.1007/BF01289630
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DOI: https://doi.org/10.1007/BF01289630