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  • 1 Central Research Institute for Physics P.O. Box 49 H-1525 Budapest 114 (Hungary)
  • | 2 State University Institute for Nuclear Sciences Proeftuinstraat 86 B-9000 Gent (Belgium)
  • | 3 National Fund for Scientific Research (Belgium)
  • | 4 University of Tanta (Egypt)
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The present paper deals with the experimental determination and the critical evaluation of Qo, the ratio of the resonance integral (Io) to the 2200 m.s–1 cross-section (o) for 57 analytically interesting (n, ) reactions, including a revision and updating of formerly published results for 13 isotopes. Full account is given for deviations from the ideal epithermal neutron flux distribution. The Budapest-Gent cooperative determinations, yielding parallel but independent results, lead to recommended Qo-values with an average uncertainty as low as 3%. Finally, with the aid of independently evaluated or measured o-data, a list of recommended Io-values is given.