An exciton model approach to the analysis of α-particle-induced nuclear reactions View Full Text


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Article Info

DATE

1976-01

AUTHORS

E. Gadioli, E. Gadioli Erba, L. Sajo-Bohus, G. Tagliaferri

ABSTRACT

Summary and conclusionsIt is suggested that the exciton model is helpful in the interpretation of reaction data obtained by bombarding nuclei with α-particles of energy greater than about 20 MeV.The comparison of the model predictions with experiments indicates thata) the shapes of the spectra of the particles emitted from the reactions, the shapes of their excitation functions and the absolute values of the cross-section can be adequately reproduced without recourse to peculiar adjustments of parameters;b) the assumption of an initial exciton numbern0=4, corresponding to state configurations of the 4p-type, accounts generally for the observed (α, p) and (α,xn) reaction data, except that for nuclei of mass number around 50÷60 a certain amount of configuration mixing of 4p and 5p+lh states seems to be required;c) the results are on the whole consistent with the hypothesis that the incident α-particle separates into its component nucleons on entering the Coulomb and nuclear fields of the target.The study of (α, α′) reactions presents evidence that some fraction of the reaction cross-section is imputable to processes that cannot be described by the exciton model. This fraction amounts approximately to 15%, and is of the same order of magnitude as that deduced earlier in the case of proton-induced reactions. Such concurrence may suggest that in both cases the fraction which is not described by the model should depend on geometrical characteristics of the interaction between projectile and target nucleus; for instance the intervention of peripheral interactions, leading to collective excitation or to nucleon pick-up, might be proposed. More... »

PAGES

1-38

References to SciGraph publications

  • 1974-06. Nucleon mean free path in nuclear matter in LETTERE AL NUOVO CIMENTO (1971-1985)
  • 1972-03. Fre-equilibrium particle emission from light nuclei in LETTERE AL NUOVO CIMENTO (1971-1985)
  • 1973-05. Interpretation of nucleon emission from the bombardment of181Ta with protons in LETTERE AL NUOVO CIMENTO (1971-1985)
  • 1974-08. Excitation functions of51V,56Fe,65Cu(p, n) reactions between 10 and 45 MeV in IL NUOVO CIMENTO A (1971-1996)
  • 1973. Pre-Equilibrium Emission in Neutron and Proton Induced Reactions in PROCEEDINGS OF THE EUROPHYSICS STUDY CONFERENCE ON INTERMEDIATE PROCESSES IN NUCLEAR REACTIONS
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/bf02747729

    DOI

    http://dx.doi.org/10.1007/bf02747729

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1006690196


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