Abstract
Threshold effects on nuclear reaction cross sections are re-examined in the frame of S-matrix theory. The Thomas-Ehrmann shift is rederived. The behaviour of poles of the S-matrix near thresholds, their distribution on the sheets of the Riemann surface and their influence on nuclear cross sections are investigated. The possibility of the occurrence of “threshold states” and of “virtual states’ is discussed. The effect of the large number of thresholds encountered in the investigation of statistical fluctuations of nuclear cross sections on the average width Γ of the compound nucleus is found to be negligible.
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